toilet germs don't just stay in the toilet. disinfect with lysol bathroom trigger... ... and lysol power foamer. they kill 99.9% of germs. to clean and disinfect your bathroom... mass shootings have become an all too familiar sight on television. this past week marked 50 years since americans first witnessed that kd anna werner take is a look back in a story for "sunday morning." >> it is a summer day in austin, as students at the university of texas stroll the campus. a day much like the one 50 years ago, long before anyone knew the term mass shooting. >> this is where -- >> yeah. >> it's the day and the spot claire wilson james will never forget. see the tower. >> oh, yeah. >> right over you. >> that day was august 1, 1966. walter cronkite anchored a special cbs news report. >> a deranged engineering student at university of texas climbed to an austin landmark at noon how to day. >> a man perched atop the university of texas clock tower began firing on the people below. >> victims were cut down on the campus as sniper zeroed in on his target with unerring accuracy. >> he shot at random. for more than 90 minutes. >> claire, an 18-year-old student, 8 months pregnant walking on campus with boyfriend tom eckman. at first didn't know what was happening. >> you never heard the shot? >> no. i never heard the shot. >> reporter: as she fell to the pavement, her boyfriend, tom, turned to ask her what was wrong. the next thing she knew, he was lying dead next to her. and she couldn't move. >> you thought you were dead? >> i thought i was going to die. yeah. >> the killer was 25-year-old charles joseph whitman, a former marine sharpshooter. unknown to anyone, he had already killed his wife and heading to the tower's 2th floor observation deck with multiple guns. it was the first school mass shooting in modern u.s. history. he affect sewed many lives in that one day. retired texas ranger, martinez was a young officer with the police department at the time. arriving on campus. he couldn't believe what they saw. >> when i got out of the car, i going on. it was look a war. >> back then, there was no such thing as rapid response teams. it was left to martinez and civilian, followed by a fellow officer, houston mccoy to climb to the top of the tower. to face off against the sniper and his arsenal. as martinez described it at the time. >> he didn't have it level. he was trying to bring it down. and >> i could tell by impact that i hit him. i kept advancing. shooting. mccoy shot and hit him. and started going down. >> the shooter was dead. he killed 16 people that day. and injured dozens more. the mass shooting brought fundamental changes to police departments. and led to the creation of swat for decades at u.t. the only reminder of the terrible day could be find on this rock. keith maitland who went to school there wondered why he never heard more. >> this is a story i think that anybody who grew up here has heard a little bit about. but if you want to get past just that little bit there isn't really a lot out there to kind of fill in the blanks. >> so he made a documentary >> we can see the movement south side of the clock. >> it uses animation and archive footage to tell the story of the day. >> the shot hit me. rick shade o ricochetted off the building. >> then what happened? >> then everybody ran. >> what i want to understand what was it look to live through something like this? and how would it impact you? >> reporter: in the process he wound up reconnecting people who it turned out had not seen each other since that day, 50 years ago. >> people like claire wilson james. >> hi, claire. >> hello, baby. >> and artly snuff. snuff was just a teenager at the time. that's him on the right in the dark shirt. running out in full view of the sniper to pick claire up and y steps to safety. something he says he simply felt he had to do. >> because she was shot. she was obviously pregnant. it was the most horrific day of my life. >> to this day? >> oh, gosh, yes. i didn't go to war. that was my war. >> because why? >> because the blood. the loss of innocence. i think what i probably learned the most is that you have to deal withdr trauma. for people who weren't given an opportunity it really sits with them and kind of eats away at them over the course of the rest of their lives. >> reporter: even people you might not expect. like ray martinez, who before he was a police officer, was a combat medic. >> reporter: he told us on the way to the tower to stop the sniper that day he was forced to run past claire as she lay bleeding on the quad without stopping to help her. >> that day -- i was thinking like a medic but also thinking like a policeman. i saw her wounded. and i felt like it was my duty to grab her and take her out of there. >> reporter: in the movie version of this, you're the guy and you are telling me that even you, are wracked by guilt? >> well, if you are a human being and you got feelings for people, yes. >> reporter: the university is now taking steps to remember those lost. this past week, a new larger memorial was dedicated. listing the names of those killed. including claire wilson james boyfriend and also her baby. and in the shadow of the tower, there is now friendship. and healing for survivors. and from claire, something else. and you forgive him? >> oh, yeah, how could -- god's forgiven me everything i have done. that kind of person.rom being - you know, that, that decide to go that way. i mean, how could i not forgive ? music ? new k-y intense. a stimulating gel that takes her pleasure to new heights. ? music ? new k-y intense. a video of a massive alligator roaming a golf course is getting a lot of attention on line. david begnaud has the story behind the siting. >> reporter: the golfers who took the video were in disbelief. a giant gator standing high on its legs just saintering across e it is a sight so unreal, that chubs, as he has become known, is something of an internet phenomenon. the individually that made him famous has been viewed more than 19 million times. but regulars here in palm meadow, florida, are unfazed. >> this is a great course, you see a lot of gators out here. big ones. fighting. running across. it's pretty intesting course. i mean it's fun. >> what most people don't tire out quickly. >> they're fast. >> they're fast for a short distance. like us old guys. you know? >> his head was about -- here. >> course manager ken powell says chub has been a fixture on the fairway for years. he believes the gafor is at least 15 feet long and likely 40 or 50 years old. when chubs comes out, play doesn't stop. if golfers hit a ball close to the reptile they just drop another one. >> he is not a nuisance alligator. we have no plans to have anybody come and take him away. he is not hurting anybody. >> reporter: once kidded endangered. alligators are federally protected species. more than 1 million reptiles in habit florida. fatal attacks on humans are rare. only six have been recorded in the state in the last 10 years. and that includes the killing of a 2-year-old boy at disney world back in june. tim geist is a trapper and says% alligators should always be treated as a potential threat. >> a lot of the public doesn't understand when they feed an alligator they're creating a monster. feed the alligator, he is going to coop coming back for more, gets bigger, bigger, bigger. sees you as potential meal. >> reporter: chubs may look like a monmonster, but the club belis as long as patrons leave him alone. golfers and gators c that's the "cbs overnight news" for this tuesday morning. for some of you the news continues. for others check back later for the morning news and "cbs this morning." from the broadcast center in new delta down. >> so we are just here, twiddling our thumbs having no idea what to do. >> a computer crash ground one of america's largest airlines, leaving thousand stranded. >> also tonight, a new zika infection in florida, but this one miles north >> a new donald trump, reads his policy off a prompter. prompting this. >> there is no other donald trump. >> at the olympics, much adieu about cupping. >> and the special guest who made a brides wedding. >> hi! oh. this is the "cbs overnight news." it was a monday meltdown for this country's second biggest airline. delta's computer system crashed. and that forced the airline to cancel 650 flights. many more were delayed leaving thousand of passengers stranded at airports all over the world. here is transportation correspondent kris van cleave. >> reporter: the fbi tells cbs computer issue that paralyzed delta air lines was due to hacking. instead the airline blames a power outage in atlanta overnight. flier paulette vernon. >> we are just here. having no idea what to do. >> reporter: at one point during the usually busy monday morning. 23 delta planes were in the air as global computer outage grounded flights for hours. passengers couldn't check in. lines at airports from los angeles to london. where passengers had to deboard some flights. in washington angela goff worried she wouldn't make it to her cruise ship in time. >> you show up. think you are getting your boarding pass and getting on the plane. we're grounded. >> reporter: the four biggest carriers have experienced computer outages. a week ago, a glitch crippled southwest for days. ed bastion. >> i apologize for the challenges this created for you with your travel experiences. >> reporter: how does this keep haen this is an industry wide problem. >> the airlines are using old systems. >> they have these multidecade old systems for dealing with passengers that are suddenly expect to deal with mobile apps, onlike check ins on the web. a lot more demand for what they're doing and doing it with pretty limited capacity. >> reporter: delta says its systems are operating once again. and is investigating why its backups didn't kick in as they charlie, delays in some places are still in the three-hour range. so the airline continues to struggle to get back on track. >> thank you, kris. it wasn't the fiery donald trump we are used to today. rather than speak off the cuff, he read off the prompter. as he delivered an economic address in detroit. a new national poll out today shows him trailing hillary clinton by 12 points among registered voters. major garrett on trump's attempt to get his troubled campaign back on track. >> she is the candidate of the past. ours is the campaign of the future. >> donald trump's top advisers have been begging him for weeks to get back on message and position himself as agent of change against hillary clinton to. day evidence of a trump conversion. >> when we reform our tax, trade, energy, and regulatory policies, we will open a new chapter in american prosperity. >> yet, trump's economic proposals align with every republican president and nominee since ronald reagan. with across the board tax cuts. federal regulations and fossil fuels. current number of brackets from seven to three and dramatically streamline the process. >> in a significant shift, trump scrapped his original tax plan. and embraced a less expensive one drafted by house republicans. with income tax brackets of 12, 25% and 33%. trump's first plan had a top and a more generous standard deduction. the nonpartisan tax policy center estimated trump's original plan would have cost more than $10 trillion in its first ten years. the house gop plan is about a third less costly. >> trump's speech was interrupted more than a dozen times by protesters in what appeared to be a coordinated effort to throw him off course. trump remained unfazed. his economic message. 50 high ranking republican national security and diplomatic advisers to presidents from richard nixon to george w. bush signed a letter opposing trump. charlie, they said trump if elect would be the most reckless president in history. trump dismissed the letter saying those to sign it were to blame making the world such a dangerous place. >> thank you, major. hillary clinton's reaction to does quickly. here is nancy cordes. >> he wants to roll back regulations on wall street. >> reporter: in saint petersburg, florida, clinton said trump would explode the debt cutting taxes for the wealthy and spending more. >> he wants to basically just repackage, trickle down economics. now, you know that old saying, help our economy grow, it does not help the vast majority of americans. >> she also mocked his new economic team. made up of 13 white men. >> hedge fund guys, billionaire guys. six guys named steve. apparently. >> clinton's adv women is one factor in her widening lead. and here is another. according to the cbs news battleground tracker, 57% of virginians think she is prepared to be president. compared to just 36% who say that about trump. after an erratic couple of weeks. >> she is truly unhinged. she is unbalanced. well. just 36% of voters view her favorably. slightly more than trump. but still lower than any winning presidential candidate in modern history. >> i want you to tell your friend, don't let a friend vote trump. >> reporter: clinton has consolidated the party around her. more than nine in ten democrats now say they plan to vote for her compared to fewer than eight in ten republicans who say that about trump. may not sound look a big difference, charlie, but it can swing an election in a country as closely divide adds this one. ,,, the number of nontravel related zika infections in florida rose to 16. this time the person is in palm beach county. 75 miles north of the miami zika zone but had traveled to miami-dade county. david begnaud has the latest on the battle of the virus linked to birth defect. aerial spraying over the zika zone at least three times now. with 17 locally transmitted zika cases. the one mile area of wynwood was a ghost town. she feared she had zika. she started having flu like symptoms. today she received good news. >> we did your test last week. it was negative. >> reporter: what was the one less thing to worry about. >> reporter: she says she has been taking precautions including using bug spray any time she is outside. >> reporter: you understand how randomly it could have been you? >> absolutely. and, and in any situation, when you become pregnant, you just accept you are not in control. one thing that you are in control of, with zika is you can prevent. >> reporter: her obstetrician, dr. maria beacham worries some patients are forgetting abut prevention. >> people want to beep tested. but do you have bug spray in your purse. you are getting tested. do you have bug spray in your purse. you have to focus on. images have to be of the mosquito, bites, that's what you need to avoid. >> reporter: tonight in palm beach county, inspectors are in the area where the new case was may have been infected. charlie the kids are about to go back to school in florida. today the governor asked education leaders to start teaching students about zika protection. >> thank you, david. folks in florida bracing for severe flooding in port richard, roads have been closed because of heavy rains. and forecast is only getting worse. some places could get 9 inches of rain in the next few days. that's because a storm system has stalled over the florida panhandle. the bad weather extends all the way to new orleans. in the pacific, tropical storm javier is bearing down on baja california. heavy air expected to pass by cabo san lucas tonight. half a foot of rain is in the forecast. and earlier storm earl dumped month worth of rain on central mexico in 24 hours. mud, that killed at least 45 people. today, soldiers and rescue teams searched for survivors in the mud and rubble. survivors were transported in military vehicles to safety. by contrast the western u.s. is bone dry. tonight, dozens of wildfires are burning out of control. evacuations have been ordered in the san bernardino mountains, east of los angeles. hundreds of firefighters and 16 aircraft are battling the pilot fire. it has burned 4500 acres. las vegas. in pakistan today, militants shot and killed a prominent lawyer. then a suicide bomber attacked the hospital where mourners had gathered. at least 70 people were killed. more than 90 were hurt. both the taliban and isis have claimed responsibility. tonight syria's biggest city is in danger of becoming a slaughterhouse. the assad regime's army backed by iran and russia surrounded from inside syria. the key turning point was reached over the weekend. when a newly formed coalition of opposition fighters including some recently affiliated to al qaeda managed to barack through government lines. they released this drone footage which shows the moment a suicide bomber drove a truck through the city, and blew himself up, allowing rebel groups to advance forward and seize a military complex with small arms ammunition and heavy artillery. it all looked so different just two weeks ago. after years of stalemate in fight for control of the city, government troops backed by russian air strikes seized the rebels last remaining supply route, cutting off an estimated 250,000 people. in a desperate bid to break the siege, opposition forcings launched a successful counter offensive and surprisingly were also able to take over the main road into the government held part of the city. where an estimated 1.2 million people live. they could be short-lived. there are growing fears of food and food shortages. and the allies, say they're amassing thousand more fighters along the front lines. the fight or aleppo is clearly intensifying and could become a pivotal battle in this war. at this stage, charlie it is unclear whether either side can actually win. >> thanks, deborah. i talked to michael morell, former deputy director of the cia and until recently a cbs news contributor. he suggests the united states should support more aggressive action by syrian rebels. >> when we were in iraq, the iranians were giving weapons to the shiaa militia willing american soldiers, iranians were making us pay a price. we need to make the, the iranians pay a price in syria, make the russians pay a price. i want to go after. i want to go after those things that assad sees as his personal power base. right? i want to scare assad. i want him to think about, this is not going to end well for me. >> coming up next, a day of fun at a water park turns tragic. later, a wedding guest brings a bride a priceless gift. breyers peanut butter gelato, rich chocolate sauce. ght is perfect. can someone read me another story? daddd? mmm coming breyers gelato indulgences an investigation is continuing tonight into a freak accident that took the life of a child at a water park in kansas city, kansas. it happened on a water slide whose name is german for insane. omar villafranco is in kansas city. to horror sunday afternoon when 10-year-old caleb schwaab was killed riding this 17 story water slide on a raft. two other passengers were injured. winter persapio is the water park spokesperson. >> all our rides are inspected every day. actually. our ride are inspected by an outside party. >> caleb the son of kansas state enjoying the park on a day honoring state lawmakers. the family released a statement saying caleb brought abundant joy to our family and although he came into contact with. >> taller than niagara falls. >> it is dubbed the tallest water slide in the world. the attraction opened in 2014 after several delays. adjustments had to be made to the second hill when test runs showed the raft launching off the slide. in this promotional video released by the company, three riders strap into a raft and drop down more than 168 feet reaching speeds of more than 60 miles per hour. passengers are thrust up and over another 50 foot drop. to ride, each passenger must be at least 4'6." the combined weight of three riders must be 400 pounds. this girl took the plunge with the 18-year-old was concerned about the velcro harness. >> i felt i had to hold on to keep my body from going up. i was so scared. >> the autopsy is complete. the results have not been released yet. charlie, the kansas city police department is leading this investigation. >> thank you, omar. still ahead, michael phelps in rio, a gold medal and purple spots. we'll dive into this next. why am i so devastatingly handsome, i'm in a fragrance... ...ad, and my sweethearts gone sayonara. this scarf, all that's left to remember. how's a guy supposed to move on! the long lasting scent of gain flings. extraordinary starts here. new k-y intense. a stimulating gel that takes her pleasure to new heights. k-y intense. this is shaving. blades here, blades there. some more over there... whoa! that's not a blade. this is gillette shielding. with lubrication before and after the blades. shields from irritation for a close, comfortable shave. proshield from gillette. france with a silver medal. medal number 19. michael phelps off to a strong start in his fifth olympics. but there was something else that everyone steamed to be talking about today. ben tracy is in rio with our on the spot coverage. >> out comes team usa. >> when michael phelps made his r if o debut. there were two questions how fast would he swim and what's with the purple mark all over his body. turns out they're the result of an ancient chinese pain relief treatment known as cupping. you can see him getting the treatment in his underarmor add. here's how cupping works. specialized suction cups pull the skin up and away from underlying muscles breaking capillaries. that draws blood to the area and speeds recovery. phelps is such a fan. he instagramed the photo of himself mid cup treatment to. day, cody miller said he is also a cupper. during training. i'll have her put cups on my back. and she is like. so gross. >> dara torres is a 12 time medalist in swimming. >> is this a fringe thing in sports or something a lot of athletes do? >> i think a low key trend now. that michael phelps has been seen with cup marks all over his body. more athletes will do it. i was doing it, in 2008 and helped alleviate the soreness. not just for professional athletes. 2-year-old, gia san angelo uses the technique to relieve the back pain. this doctor treats her at mount sinai hospital in new york. >> cupping actually jump starts the body's natural healing process. you can increase the blood flow and let the body do what it does to help resolve the issue. >> reporter: there isn't a lot of good scientific evidence ,,,, we end tonight with affairs of the heart. a decade ago, her father gave the stranger the gift of life. now the stranger has returned to give jenny the gift of a lifetime. here is jim axelrod. ? ? >> reporter: to make a wedding man walk her down the aisle she met the first time just the day before. >> hi! >> hi, jenny. >> reporter: but jenny was positive she could trust arthur thomas' heart. >> thank you so much for coming. >> are you kidding. >> after all, it belonged to her father michael. >> the heart, that's right. was killed in a robbery near pittsburgh ten years ago. hundreds of miles away in philadelphia, arthur thomas' failing heart had him on a transplant waiting list. but hope was slipping away. >> i was on death's door. when, when -- when he was murdered. and i needed a heart or i was going to be dying within the next few days. >> fast forward a decade to a letter jenny mailed to arthur thomas. >> and she said, dear tom, i'm the daughter of the man whose heart is inside of you. would you walk me down the aisle. >> reporter: which is how jenny stepian got to have her father's beating heart with her for the biggest moment of her life. >> it awe just like having my dad here and better because we get to share the story with other people. and other people see that organ donors do matter. >> and that's how hearts were both breaking at this wedding saturday. and filled to the brim as well. that's the overnight news for this tuesday morning. for some of you the news continues. for others, check back with us a little later for the morning news and cbs this morning. this is the "cbs overnight news." welcome to the overnight news. republican presidential nominee donald trump has outlined his plans to create jobs and cut taxes in a major economic policy speech in detroit. long argued that business experience qualifies him to lead the d' monday he offered details on the changes he would make if he wins the presidency. here is some of what trump had to say. >> i am proposing an across the board income tax reduction for middle-income americans. this will lead to millions of new, really good paying jobs. the rich will pay their fair share. but no one will pay so much that it destroys jobs, or undermines compete. tax simplification will be a major feature of the plan. our current tax code is so burdensome, and so complex, that we waste 9 billion hours a year in tax code compliance. my plan will reduce the current number of brackets from 7 to 3. and dramatically streamline the process. we will work with house republicans, on this plan, using the same brackets they have proposed. 12%. 25%. and 33%. for many americans, their tax rate will be 0. under my plan, no american company will pay more than 15% of their business income in taxes. in other words, we're reducing your taxes from 35% to 15%. small businesses will benefit the most from this plan. much as three times more in taxes than what i am proposing. and her owners regulations will put them totally out of business and you went be able to start. you cannot ever start a small business under the tremendous regulatory burden that you have today in our country. i am going to cut la massively. my plan will also help reduce the cost of child care. by allowing parents to fully deduct the average cost of child care spending from their taxes. we are also going to bring back american businesses that are now parked overseas, they can't bring their money back into our country. our plan will bring that cash home, applying only a 10% tax. >> hillary clinton will define her own economic vision in an address thursday. democratic presidential nominee will lay out her case in detroit. nancy cordes is covering the clinton campaign. >> an economy that works for everyone. >> reporter: clinton's focus on the economy as trump veers offcourse. >> she is a monster. >> may be paying off. 57% of virginians tell cbs news she is prepared to be president compared to 36% who say that about trump. name calling, probably doesn't help. >> she is a totally unhinged person. she's's unbalanced. >> the comparison enabled clinton to take the lead though she performs poorly in some she can bring change to washington. or that she tells the truth. >> so i may have short circuited it. >> clinton gave a tortured explanation friday for why she mischaracterized the fbi director's comments, claiming incorrectly he said she never publicly lied about her e-mails. >> director comey said my answers were truthful. that's the bottom line. what i told the fbi which he said was truthful is consistent >> she is lying about lying. >> republicans argued she was parsing her word. >> she has a fundamental way to say to people. i didn't lie to you. i didn't remember what i was going to say. >> mystery surround the execution of an iranian scientist accused of being informant for the united states. over the weekend. iran announced he was hanged as includes execution, nuclear secrets and u.s. diplomacy. a scientist with vital information on deadly nuclear weapons defects to the states. seven years later his family says he was hanged. the big question here is, what made dr. amiri return to iran. his love for his son, may have cost dr. amiri his life. he was reunited with his fame having received a hero's welcome in tehran in 2010. his story at the team that he had been kidnapped by cia agents. beans on iran's nuclear program. it soon became clear iranian authorities weren't buying his version of events. he disappeared. presumably imprisoned until this weekend's announcement. officials said amiri was executed for giving america what they called the great satan, vital and secret information. his execution ends what was a murky tale even by the standard of international espionage. secretabout his country's nuclear program. but months later, wanted to go home. >> he seems to have gotten cold feet. >> the senior vice president for the center for strategic and international studies. >> he came up with different stories all of which were about him going back and being with his family in iraq. >> one of the stories claimed he had been kidnapped by the cia while on pilgrimage to mecca and tortured in eight months of captivit then secretary of state, clinton said amir is his own man. >> mr. amiri has been in the united states of his own free will. and he is free to go. >> reporter: being part of iran's nuclear program is a dangerous game. amiri would have known the risks. >> from their perspective this is how uh you treat traitors it is a little surprising to me. amiri couldn't have anticipated >> now the state department would give no further comment on amiri this morning. in e-mails released from clinton's private servers, conversations refer to him as a friend who pose aid diplomatic, psychological issue in the days before he left the u.s. first kid you ready? by their second kid, every mom is an expert, and more likely to choose luvs than first time moms. new luvs with nightlock plus absorbs wetness faster than huggies snug & dry, to help stop leaks - even overnight. and you can save up to $150 per year by choosing luvs over huggies. guess what i just did? built a sandcastle? ha, no, i switched to geico and got more. more? 24/7 access online, on the phone or with the geico app. that is more. go get some mud... all that "more" has to be why they're the second-largest auto insurer. everybody likes more. this pimple's gonna last forever. aw com'on. clearasil ultra works fast to begin visibly clearing up skin in as little as 12 hours. and acne won't last forever. just like your mom won't walk in on you... forever. at the rio summer olympics, michael phelps may be soaking up attention for the swim team. another american swimmer is in the middle of an extraordinary come back. >> his name may not be the most familiar on the u.s. swim team. anthony ervin, his story is certainly the most fascinating. later this week, at the age of 35, he will be the oldest male swimmer to compete in an individual event at the games, since 1904. but this isn't his first olympics. he won gold back in 2000. at the age of 19. and then vanished from the sport entirely. >> 15 meters left. when anthony ervan tied for gold as a 19-year-old in the 2000 games in sydney. >> no. >> it was supposed to be the >> going to the olympic games is an honor, enormous privilege. >> gary hall, anthony irvan. share the gold. >> instead, it led to the most tumultuous time of his life. >> part of what led to a lot of the angst initially was doing well and performing well, the social kind of like joy that comes from others and knowing that one has done well, and you kind of get hooked on that. you kind of need that to sus sustain yourself. african-american. >> the first swimmer of african-american descent to make the u.s. team. >> the only problem he never identified as a black man. >> did it really piss you off when people called you the first african-american swimmer? >> i wouldn't say it pissed me off, but it created an an immense amount of confusion. >> at the height of it all, he 2003. >> post olympic champion status was about rediscovering, rebuilding myself, the way i wanted to be not the way others were, at least the way perceived wanted me to be. >> reporter: over the next decade, ervan sold his gold medal, donated money to charity and took off on a spiritual quest. he dabbled in everything from zen buddhism to the hard partying lifestyle of playing in rock band. instead of a pool, he sank into depression. suicide attempt, and a death defying motorcycle accident. nearing age 30, he desperately need a shot at redemption. >> for me, getting the tattoos was a way of reclaiming my skin and regaining control of myself. >> armed with ink he went back to school and started coaching at a swim camp for kids. the kids helped him remember what he loved about swimming in >> the water when i was a child, a place of freedom the a place of expression and play. a place where everything else can kind of fall away and into this meditative state. and -- i got that back. >> he dove back into competition, and a dozen years after his last olympics, qualified for the 2012 games. with a personal best time in the 50 meter freestyle race. but in london, he only placed fifth. >> he is probably the most interesting human being on our team. maybe in the whole olympic team. we're going for the gold. >> david marsh one of the u.s. he has known ervan since anthony was 17 years old. earlier this year, he started training him for another shot at gold. >> he arrived in my place, eight weeks before the olympic trials. didn't seem as confident as i felt he need to be for the games. then he became anthony again. anthony has the most brilliant sprint freestyle stroke on the planet. the stroke carried him to one of the fastest times he ever posted and earned him a ticket to rio. >> wasn't like i demanded this of myself. >> reporter: you didn't stay i am getting back in the pool and going to make the next olympics. >> no way. he has no expectations for the future, but more importantly no regrets about the past. >> i really try to avoid regret. i don't think anybody should be stuck in the past. that's a dead life if you are stuck in the past. life moves forward. >> because irvan helped the u.s. swim team win the 400 relay race record for longest gap of a u.s. swimmer between medals. 16 years set way back in 1924. >> the "cbs overnight news" will be right back. dove men+care. the strength test. like leather, skin is stronger when it's hydrated. that's why dove men+care bodywash has a unique hydrating formula to leave skin healthier and stronger. extraordinary starts here. new k-y intense. a stimulating gel that takes her pleasure to new heights. k-y intense. >> important message for residents age 50 to 85. write down this number n right now, people are receiving this free information kit for guaranteed acceptance life insurance with a rate lock through the colonial penn program. if you are on a fixed income, learn about affordable whole life insurance that guarantees your rate can never increase for any reason. if you did not receive your information, call this number now. your acceptance is guaranteed, with no health questions. here to tell you about a popular life insurance plan with a rate lock that locks in your rate for life so it can never increase. did you get your free information kit? if not, please call this number now. this affordable plan through the colonial penn program has coverage options for just $9.95 a month. your rate is locked in and can never go up. and your acceptance is guaranteed, with no health questions. see how much coverage you can get for just $9.95 a month. for your free information kit. mass shootings have become an all too familiar sight on television. this past week marked 50 years since americans first witnessed that kind of horror on tv. anna werner takes a look back in a story for "sunday morning." >> it is a summer day in austin, as students at the university of texas stroll the campus. a day much like the one 50 years ago, long before anyone knew the term mass shooting. >> this is where -- >> yeah. see the tower. >> oh, yeah. >> right over you. >> that day was august 1, 1966. walter cronkite anchored a special cbs news report. >> a deranged engineering student at university of texas climbed to an austin landmark at noon how to day. >> a man perched atop the university of texas clock tower began firing on the people below. >> victims were cut down on the campus as sniper zeroed in on his target with unerring accuracy. >> he shot at random. for more than 90 minutes. >> claire, an 18-year-old student, 8 months pregnant tom eckman. at first didn't know what was happening. >> you never heard the shot? >> no. i never heard the shot. i just felt a big jolt. then i started falling. >> reporter: as she fell to the pavement, her boyfriend, tom, turned to ask her what was wrong. the next thing she knew, he was lying dead next to her. and she couldn't move. >> you thought you were dead? >> i thought i was going to die. yeah. >> the killer was 25-year-old charles joseph whitman, a former marine sharpshooter. unknown to anyone, he had already killed his wife and mother in their homes, before heading to the tower's 2th floor observation deck with multiple guns. it was the first school mass shooting in modern u.s. history. he affected so many lives in that one day. retired texas ranger, martinez was a young officer with the police department at the time. arriving on campus. he couldn't believe what they >> when i got out of the car, i could hear all of the shooting going on. it was look a war. >> back then, there was no such thing as rapid response teams. it was left to martinez and civilian, followed by a fellow officer, houston mccoy to climb to the top of the tower. to face off against the sniper and his arsenal. as martinez described it at the time. >> he didn't have it level. and i just kept firing. >> i could tell by impact that i hit him. i kept advancing. shooting. mccoy shot and hit him. and started going down. >> the shooter was dead. he killed 16 people that day. and injured dozens more. the mass shooting brought fundamental changes to police departments. and led to the creation of swat teams used around the country. could be find on this rock. keith maitland who went to school there wondered why he never heard more. >> this is a story i think that anybody who grew up here has heard a little bit about. but if you want to get past just that little bit there isn't really a lot out there to kind of fill in the blanks. >> so he made a documentary >> we can see the movement south side of the clock. >> it uses animation and archive footage to tell the story of the day. >> the shot hit me. ricochetted off the building. >> then what happened? >> then everybody ran. >> what i want to understand what was it look to live through something like this? and how would it impact you? >> reporter: in the process he wound up reconnecting people who it turned out had not seen each other since that day, 50 years ago. >> people like claire wilson james. >> hi, claire. >> hello, baby. >> and artly snuff. snuff was just a teenager at the time. that's him on the right in the dark shirt. running ou f sniper to pick claire up and carry her some 100 yard down the steps to safety. something he says he simply felt he had to do. >> because she was shot. she was obviously pregnant. it was the most horrific day of my life. >> to this day? >> oh, gosh, yes. i didn't go to war. that was my war. >> because why? >> because the blood. the death. the horror. i think what i probably learned the most is that you have to deal with trauma. for people who weren't given an opportunity it really sits with them and kind of eats away at them over the course of the rest of their lives. >> reporter: even people you might not expect. like ray martinez, who before he was a police officer, was a combat medic. [ gunfire ] >> reporter: he told us on the way to the tower to stop the sniper that day he was forced to run past claire as she lay bleeding on the quad without stopping to help her. >> that day -- i was thinking like a medic but also thinking like a policeman. i saw her wounded. and i felt like it was my duty to grab her and take her out of there. the day. and you are telling me that even you, are wracked by guilt? >> well, if you are a human being and you got feelings for people, yes. >> reporter: the university is now taking steps to remember those lost. this past week, a new larger memorial was dedicated. listing the names of those killed. boyfriend and also her unborn baby. and in the shadow of the tower, there is now friendship. and healing for survivors. and from claire, something else. and you forgive him? >> oh, yeah, how could -- god's forgiven me everything i have done. and he has kept me from being that kind of person. you know, that, that decide to i mean, how could i not forgive him?,,,, a video of a massive alligator roaming a golf course is getting a lot of attention on line. david begnaud has the story behind the sighting. >> reporter: the golfers who took the video were in disbelief. a giant gator standing high on its the golf course. it is a sight so unreal, that chubs, as he has become known, is something of an internet phenomenon. the individually that made him famous has been viewed more than 19 million times. but regulars here in palm meadow, florida, are unfazed. >> this is a great course, you see a lot of gators out here. big ones. fighting. running across. i mean it's fun. >> what most people don't realize, these things go very short distances billion out they tire out quickly. >> they're fast. >> they're fast for a short distance. like us old guys. you know? >> his head was about -- here. >> course manager ken powell says chub has been a fixture on the fairway for years. he believes the gator is at least 15 feet long and likely 40 or 50 year doesn't stop. if golfers hit a ball close to the reptile they just drop another one. and play right on through. >> he is not a nuisance alligator. we have no plans to have anybody come and take him away. he is not hurting anybody. >> reporter: once considered endangered, alligators are federally protected species. more than 1 million reptiles in habit florida. fatal attacks on humans are rare. only six have been recorded in the state in the last 10 years. and that includes the killing of a 2-year-old boy at disney world back in june. alligators should always be treated as a potential threat. >> a lot of the public doesn't understand when they feed an alligator they're creating a monster. feed the alligator, he is going to coop coming back for more, gets bigger, bigger, bigger. sees you as potential meal. >> reporter: chubs may look like a monster, but the club believes as long as patrons leave him ? it's tuesday, august 9th, 2016. this is the "cbs morning news." donald trump tried to stay on message, but his economic speech republicans from jumping ship. a new poll gives hillary clinton an even larger lead, but a new lawsuit blames her for two deaths in benghazi. and bad blood in the water. with the staredown and a record breaking swim american lily king gets her revenge against her russian rival in rio.

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