the big feature going away. good evening on this very busy wednesday night. and we begin here with a stunning new image caught on a neighbor's surveillance camera. a 71-year-old man shot while working in his lawn. it is a chilling reminder of a city already in crisis. you can see the two suspects approach on bikes. one man then wrestling with the homeowner. moments later, that homeowner is shot. and you can then see him trying to find help. tonight, we've learned he's in intensive care. that city in shock. and it comes after that stunning new number. 500 homicides, just this year. abc's alex perez with the video from chicago tonight. >> reporter: it takes just seconds, as 71-year-old frederico laguardia, out watering his lawn, when two young men on bikes ride past him. plagng chicago. with laguardia still standing there, one of the men returns, confronting the senior citizen, wrestling him to the ground, shooting him and rifling through his pockets. then getting back on his bike and riding off. laguardia wounded, but able to stand, staggers across the lawn. clutching his abdomen, he walks to a neighbor's door. no answer. laguardia sits on the steps and calls for help. >> it's just absolutely ridiculous. i mean, you can't -- you're not even safe in your own yard. >> reporter: tonight, the shooting of frederico laguardia, shooting of more proof of the violence gripping some chicago neighborhoods. >> this is not an individual thing. it happened to all of our grandfathers. it happened to all of our fathers. it's happened to all of our sons. >> reporter: nearly 3,000 shootings in chicago just this year. 500 people killed in the wave of violence. 90 dead in august alone -- the deadliest month in two decades. >> it's not a police issue, it's a society issue. you know, impoverished neighborhoods, people without hope do these kinds of things. frederico laguardia's neighbors with this appeal to the parents of those young men on the bikes. >> if you can identify that's your child on there, do the right thing before you get that knock at your door, that your child has been arrested. because it's coming. it's coming. >> and alex perez is live in chicago tonight. and alex, you've reported extensively on the violence there, the efforts to bring it in check. and tonight, the victim's family is with him? >> reporter: that's right, david. we talked to laguardia's wife hospital, doing better and in fair condition. neighbors who live here tell us, this shooting is just another sign of the crisis so many people in this city are facing. david? >> alex perez in chicago for us to lead us off. alex, thank you. we are also tracking a deadly tropical system that slammed into mexico, and is now barrelling across the southwest and moving across this country tonight. in parts of the southwest, a month of rain in just hours. what was tropical storm newton now triggering flash flooding in and tonight, flash flood watches in the center of the country. green bay, wisconsin, getting an inch of rain in just 15 minutes. parts of this system are now moving up toward the midwest. chicago and other cities in the bu bulls-eye. it will very likely bring travel headaches. so, let's get right to meteorologist rob marciano, with live us tonight with more on the track. how much rain is wind is coming, rob? >> reporter: good evening, david. well, it began with what's left of hurricane newton. nearly made it to the arizona border as a tropical storm. very impressive. right now, the center is nearly over tucson. picture, most of the moisture is off to the east. so, i think new mexico is the biggest threat for flash flood. then it gets drawn up into this northern system and heavy rain across the midwest. flash flood watches posted from des moines all the way through western parts of michigan. severe storms tonight, eastern dakotas. a tornado threat there. and a batch of storms also to the south. chicago, got a couple of rounds tonight. could see some strong storms there. brace for that. and brace for the heat across the east tomorrow. look at the heat index values. over 90 in new york. near 100 degrees in philly and d.c. you thought summer was over? well, not quite yet. >> rob marciano with us live tonight. rob, thanks, as always. now, to major developments in the race for the white house tonight. this evening, the commander in chief test. donald trump once saying that he had a plan to take out isis that he would not reveal. tonight, trump now revealing what his first step would be, if elected. but about that secret plan? abc's jonathan karl on the trump campaign tonight. >> reporter: today, donald trump rolled out plans for a massive, and pricey, buildup of the military. >> peace through stren >> reporter: trump was borrowing the phrase made famous by ronald reagan. >> and to maintain that peace requires strength. >> reporter: but how would trump use the beefed-up military to fight isis? >> i know more about isis than the generals do, believe me. >> reporter: for more than a year, he's said he has a secret plan. >> there is a method of defeating them quickly and effectively and having total victory. i don't want the enemy to know what i'm going to do. a foolproof way of winning. >> reporter: now, he says the plan is to ask for a plan. >> immediately after taking office, i will ask my generals to present to me a plan within 30 days to defeat and destroy isis. >> reporter: clinton says trump just doesn't know what he's talking about. >> he says he has a secret plan to defeat isis, but the secret is, he has no plan. >> reporter: and in a new ad, a pro-clinton super-pac uses trump's own words to portray him as dangerous. >> i'm really good at war. i love war, in a certain way. including with nukes. >> reporter: today, trump used that very line of attack against clinton, pointing to, among other things, her support for the iraq war. >> she's trigger happy, and very unstable, whether we like it or not. that's what's going on. she's also reckless. >> reporter: and what would clinton do about isis? she's ruled out sending in ground troops, saying essentially, that she would in their joint interview with david muir, clinton's running mate put the choice on national security in stark terms. >> i have a son in the military who is deployed overseas right now. i completely count and trust hillary clinton to be a great commander in chief, and to make the right decisions for the country. and the prospect of donald trump making those decisions about the life of my kid and millions of people who serve scares me to death. >> and jonathan karl with us live tonight here in new york. and jon, on this commander in chief question, hillary clinton receiving a rare endorsement tonight. >> reporter: she won the endorse pt, david, of a newspaper that almost never endorses democrats. "the dallas morning news," which hasn't endorsed a democratic presidential candidate since world war ii, is endorsing hillary clinton, and they are citing national security, saying, quote, for all her warts, she is the candidate more likely to keep our nation safe. david? >> jon karl with the endorsement from texas there. jon, thank you. and you heard donald trump today. it was last night here, we asked him about what he said about hillary clinton's appearance, that she doesn't look presidential. tonight, someone now coming to clinton's defense. her daughter. abc's cecilia vega on the clinton campaign. >> reporter: tonight, chelsea clinton jumping head-on into the political fray, going directly after donald trump for telling david hillary clinton doesn't look presidential. >> you've often talked about hillary clinton's stamina. >> right. >> you've even said she doesn't >> i really do believe that, yes. >> what do you mean by that? >> well, i just don't think she has a presidential look and you need a presidential look. you have to get the job done. i think if she went to mexico, she would have had a total failure. we had a big success. >> but when you talk about her not looking presidential, are you talking about aesthetics here? >> i'm talking about -- hey, by the way, she says things about me that are horrible. >> reporter: asked about it today in pennsylvania, chelsea clinton did not hold back. >> i would hope that everyone misogynistic, sexist rhetoric that i'd hoped we moved beyond in the 21st century, certainly in 2016. >> reporter: a new mom, her last big political splash at the democratic convention. >> and our next president, hillary clinton. >> reporter: hillary clinton watching proudly backstage as her daughter introduced her. now, with 62 days to go, chelsea clinton is back on the campaign trail and on the attack. >> and cecilia vega live with us tonight from charlotte. and cecilia, it's not just chelsea clinton, you're learning about some others who will be out there hitting the campaign trail for hillary clinton. >> reporter: she is calling in the big guns, david. also fresh off that big speech at the democratic convention, where many say she stole the show, first lady michelle obama will next week be out campaigning for hillary clinton for the very first time. david, the president will be out there next week, too. >> cecilia vega on the campaign trail, every step of the way. cecilia, thank you. and next, to georgia tonight. two planes colliding in mid-air, taking three lives. those planes may have been trying to use the same runway at no traffic control. and it turns out, there are thousands of other airports just like it. abc's steve osunsami on the investigation tonight. >> reporter: witnesses say that both single engine planes crashed mid-air, because they were trying to land at the same time. and there's only one runway at this regional airport an hour west of atlanta. >> both aircraft are really on top -- one is on top of the other one here at the end of this runway. three people have lost their lives. >> reporter: what's left of both planes is seen here, just short of the runway. authorities say one of them was used to train pilots. >> both aircraft were on final approach to land. they came together and they stayed together and came down together to the ground. >> reporter: this is what they call a non-towered airport, with no one directing traffic. the pilots are on their own. there are 20,000 of these across the country. just last week, five people died when two small planes collided mid-air over rugged terrain in alaska. the cause is still unknown. investigators believe only one of the planes had equipment that aircraft on a screen similar to what's used by air traffic controllers. authorities here in georgia say they're fortunate there was no fire and that the planes didn't collide over homes. david? >> steve, thank you. we turn next to late developments from california tonight, a possible break in a cold case after more than 20 years. 19-year-old kristin smart vanished. the fbi is now excavating a hillside near the school she was attending, hoping to find her body. and tonight, they are now officially calling it a crime scene. abc's kayna whitworth is in california. >> reporter: tonight, investigators digging in on this college campus, in a new search for kristin smart, the cal-poly student who vanished after a party here two decades ago. police never found her body. but a fresh look at the case leading them here. police dogs trained to find human remains, zeroing in. >> you want to be here 24/7, working on it, and you want to be able to make that in-person notification that you've found kristin, and that's kind of the >> reporter: police have long called this man a person of interest. paul flores, the last person seen with kristin. the smart family even hiring a private detective to follow him, but flores denied any involvement and was never charged. no physical evidence ever tied him to kristin. tonight, smart's parents saying "we are confident that the person of interest will soon be held accountable for taking her life and harboring her remains." david, investigators say the dogs pinpointed three different locations there behind me, and they're hoping that they find something before the fall semester starts. david? >> kayna whitworth, our thanks to you. and next, to that other cold case solved after more than 25 years. we told you about it last night. 11-year-old jacob wetterling was abducted in his quiet minneapolis neighborhood back in 1989. it shook the nation. yesterday, danny heinrich confessing to kidnapping, assaulting and killing jacob, and he showed police where he buried him. in all of that time, his mother hoped, but yesterday, the heartbreak took hold and we're now hearing from her. sorry. it's incredibly painful to know his last days, last hours, last minutes, because for us, jacob was alive until we found -- until we found him. >> a mother's grief. and jacob's murderer was sentenced to 20 years in a plea deal. but he could remain in custody well beyond that. next here this evening, fresh outrage over the $1.7 billion the u.s. paid to iran earlier this year. the white house is being accused of paying ransom, because one payment was handed over just as tehran released american prisoners. well, tonight here, new details of how and why that giant sum of money was delivered to iran. here's abc's chief global affairs correspondent martha raddatz, following the money tonight. >> reporter: it was a moment celebrated in the u.s. at the time -- the release of those four americans held by iran for years. intriguing story. pallets of cash, $1.7 billion in foreign currency, shipped to iran on a private plane. payment for a failed arms deal from the '70s, interest included. the first installment, $400 million, happening just as the four americans were freed. the administration denies accusations this was a ransom payment, but has acknowledged the money was used as leverage to ensure the prisoners were released. >> and so, let's get right to martha tonight. martha, these payments are not illegal, but we didn't know until now, there were three cash deliveries? >> reporter: well, they had said they were paying iran, but they had not provided any details, certainly nothing about plane-loads of cash, david. but that happened because iran and the u.s. have no direct banking relationship. but some republicans on the hill are furious, and trying to get the money back. david? >> all right, martha, my first time talking with you since it was announced you will moderate one of the debates, and we >> thanks, david. we move onto other news overseas. there are new tensions with russia this evening. the pentagon reporting a dangerous close encounter with a russian fighter jet. a u.s. navy reconnaissance plane was flying in international air space over the black sea, when the russian jet came within ten feet. a move considered unsafe and unprofessional. the u.s. crew attempted to make contact, but received no response. there is still much more ahead on "world news tonight" this wednesday. americans collecting benefits for injuries they don't have. it's your money. we've shown you the woman collecting disability, appearing on "the price is right." tonight, our team is back on the case. the man claiming to be disabled caught roller skating, playing football, and how much of your money did authorities say he got away with? also ahead, the mystery of the missing 9/11 flag, made famous in this iconic photo. we have new developments coming in on that 9/11 flag. and then, the spoiler today. apple unveiling its newest revealing the big secrets beforehand. the big feature that won't exist. we'll be right back. the first person to survive alzheimer's disease is out there. and the alzheimer's association is going to make it happen by funding scientific breakthroughs, advancing public policy, and providing local support to those living with the disease and their caregivers. but we won't get there without you. visit alz.org to join the fight. with the right steps, 80% of recurrent ischemic strokes could be prevented. and i'm doing all i can to help prevent another one. a bayer aspirin regimen is one of those steps in helping prevent another stroke. be sure to talk to your doctor what's going on here? i'm val, the orange money retirement squirrel from voya. we're putting away acorns. you know, to show the importance of saving for the future. so you're sort of like a spokes person? next tonight, to your money. the veteran bilking more than $1.5 million from the v.a., claiming to be fully disabled. pictures showing him running and roller skating. tonight, he's behind bars, but abc's david wright was one-on-one with him before he was sent to prison. he's still claiming he deserved those taxpayer dollars. >> reporter: there's dennis paulsen arriving at a wheelchair for a checkup. later, investigators followed him and found he could walk just fine. and play pool. >> by the time he was caught, he defrauded more than $1.6 million from the government. >> reporter: a whopping sum he ripped off from taxpayers. >> come on down! >> reporter: like the postal worker, whose workman's comp claim was undone by an appearance on "the price is right," paulsen was living a he was diagnosed with m.s., but clearly, he hadn't lost permanent use of his hands and feet as he had claimed. after he was convicted, he sat down with us for an interview. >> we wouldn't even be discussing this if i went to afghanistan or iraq and got my legs blown off, competing at the invictus games. >> reporter: i think there are a lot of vets who would be offended by that. >> what i'm saying is, they get looked at as inspiring. but i get looked at like i'm a fraud? because you can't see the disease? behind bars. disability fraud costs the taxpayers hundreds of millions of dollars a year, and prosecutors say what makes this case unusual is that paulsen got away with it for more than 20 years. david? >> david wright, thank you. when we come back, apple revealing its new iphone, but did amazon spill the biggest secrets with the list it put out this morning? also, the football player making national headlines, protesting the national anthem. well, now, nfl commissioner silence. what he's saying about this, in a moment. i refuse to lie down. why suffer? stand up to chronic migraine... with botox?. botox? is the only treatment for chronic migraine shown to actually prevent headaches and migraines before they even start. botox? is for adults with chronic migraine, 15 or more headache days a month each lasting 4 hours or more. it's injected by a doctor once every 12 weeks. and is covered by most insurance. effects of botox? may spread hours to weeks after injection, ms. alert your doctor right away, as difficulty swallowing, speaking, breathing, eye problems, or muscle weakness can be signs of a life-threatening condition. side effects may include allergic reactions, neck and injection site pain, fatigue, and headache. don't take botox? 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