Of breaking news, we begin with that story out of colorado. A student with a shotgun at Arapahoe High School 30 minutes outside denver, these are high school children, evacuating their school, hands in the air, patted down by authorities as part of a search for the gunman. When it was over, cheerful reunions, a scene now eerily familiar in this country. Youll recall tomorrow is the one Year Anniversary of the shooting at Sandy Hook Elementary School in connecticut. But new details are still pouring in out of colorado tonight. We head to abcs Clayton Sandell with the latest right now. Reporter friday afternoon at Arapahoe High School, students streaming from classrooms, evacuated by police officers, guns drawn. If we have anyone else available i need more Resources Available at this school. Reporter single file, hands above their head, some frisked. The terror began at 12 33, when the janitor sounded the alarm. As i turned, i saw a young man, just kid, entering the building running kind of military style, and i looked, and i double looked, and it was a shotgun. Reporter Police Believe the shooter entered the school with a shotgun and a mission. Was looking for an individual teacher he identified by name. Reporter the janitor tells us the shooter called out the name of the man seen here, showing off a debate team trophy, tracy murphy, the school librarian. Police say the gunmans target deliberately left the school to try to save more kids, they wouldnt confirm that it was murphy. At some point two students shot. The school went into lock down, teachers barricading their students into classrooms and closets. All of a sudden we heard bang bang, really fast. And then this girl came running down the stairs screaming, help me, theres a shooter. And she had blood all over her shirt. And then our teacher just put us in the closet, and we didnt hear anything else about that and then we just heard somebody try to come in our classroom, and we heard screaming and yelling, it was just terrible. Reporter police and fbi swat teams descended on the scene, within 20 minutes of the first shots fired, they found the suspect dead. The suspect has been found inside the school, and he has deceased as a result of what appears to be a self inflicted gunshot wound. Reporter todays incident just the latest mass shooting in colorado. Arapahoe High School Just 15 miles from aurora, site of last years Movie Theater massacre, only eight miles from columbine high school. Did you ever think Something Like this would happen at your kids school . To be honest, there is hardly a day that goes by, when they leave, that i dont have kind of a fleeting thought about that. Reporter there have been more than 19 School Shootings since the sandy hook tragedy. This afternoon, the all too familiar images, frantic parents rushing to the scene, texting their kids. Frantic to make sure the ones they love most are okay. Diane, you can see tonight there is a Huge Police Presence here, as for those two students, one student, a girl, was shot. Shes in serious condition. We are told was in surgery, but theres a bit of good news, a second student, who was shot, suffered only minor injuries, and has gone home from the hospital. Clayton, the news is still coming in. Anything on the shooter or a motive . Reporter at this point, we only know that the student was a student here at the high school. That we believe he was a senior. There is we dont know his name yet. Law enforcement has it but are not releasing it. They are going to his house, they are searching it, talking to friends, family, maybe coworkers to find any clue as to what may have prompted todays attack, diane. All right. Clayton sandell, so eerily familiar, this story tonight. And we will be staying on that story, but we have other developing news tonight, a terror plot in the heart land, and the arrest of a man who worked at an airport in kansas, accused of driving a truck full of explosives into the airport at wichita. How close did he come . Senior justice correspondent, Pierre Thomas on this story. Reporter the deadly plan, to detonate a car bomb at this wichita, kansas airport. The suspected bomber, terry loewen, a local airplane technician who had a security pass to the airport. According to fbi, loewen was planning a suicide operation, to cause maximum carnage and death at the states busiest airport. The threat was real. Terry loewen was real. And terry loewen was committed to execute the plan. Reporter at 5 40 a. M. Today loewen allegedly drove a van he thought was packed with explosives to a security gate. The bomb was a dud. It was all a sting controlled by the fbi. The fbi became aware of loewen after he allegedly began posting radical comments on the internet. They sent agents posing as al qaeda operatives to work with him. Authorities say he was hell bent on murder. He talks about commitment to the crime and commitment to martyr himself as part of this horrific event. Reporter Court Documents detail the commitment. In a suicide letter dated wednesday, december 11, loewen allegedly wrote goodbye to his family, my only explanation is that i believe in jihad for the sake of allah and for the sake of my muslim brothers and sisters, i expect to be called a terrorist, which i am, a psychopath, and a homicidal maniac. The case suggest the Osama Bin Laden and al awlaki inspire from their graves. Loewen said he read about both men on the internet and was inspired by awlakis 44 ways of jihad, a handbook for radicalism, diane. Thank you, pierre. There is also news tonight, about that american grandfather held hostage in iran. Today a revelation. A lawyer for his family said he was on a spy mission, a rogue cia mission. Abcs chief investigative correspondent brian ross with the new information tonight. Reporter over the seven years that bob levinson became americas longest held hostage ever, he was described again and again by the u. S. Government as a private citizen, who went missing on a business trip to iran. Today, a family lawyer, david mcgee, revealed levinson was actually a u. S. Spy. The cia spent bob levinson to iran to do an investigation on their behalf. Reporter he was working for the cia. He was. Reporter the surprising admission from his family came one day after the Associated Press and Washington Post first reported levinsons cia ties. Rejecting u. S. Government concerns, that were repeated today, that the story could put levinsons life at further risk. A story we believe was highly irresponsible to publish. Reporter according to his family, levinson was involved in a number of Missions TargetingIrans Nuclear supply network but working for a rogue unit at the cia, not cleared for such assignments. They werent authorized within the cia to do that. But he was so productive, they had a hard time not doing it. Reporter when levinson got caught on his last trip to meet a source on the iranian island of kish in 2007, mcgee says the cia lied to his family and congress about his role. Rather than acknowledge what they had done and try to save bobs life, they denied him. Reporter mcgee says the cia has since apologized and paid 2. 5 million to levinsons family with three cia employees forced out. The last time his family had proof he was alive was in this video three years ago. 33 years of service. Reporter since then the family says the u. S. Has done not enough to get his release. Please help me. Reporter levinsons family says it has decided to reveal all in hopes it will put more pressure on the u. S. To push for his release. Figuring the iranians already know he was working for the cia. Endlessly complicated, this whole story. Thank you, brian ross. Next we move to the fact American Families heading to this weekend, 110 million of us are bracing for another round of snow, sleet and ice. Look from missouri to massachusetts, every state and major city will get hit. The storm path stretching more than 1,000 miles. Abcs ginger zee is tracking it all. Reporter from west michigan to western new york. The roads barely visible. Slow down, i was only doing 50, people were passing me big time. When they pass you, you cant see. Reporter she was part of a 40 car pile up in michigan. And in upstate new york, blinding bands of lake effect snow, dropping just inches in some towns, and more than four feet in others. Our rob nelson is there. Here in new york, it snowed overnight and half the day, now almost two feet of snow on the ground. Reporter then we had him drive just six miles south, six miles, and you get another two feet of snow. Now were here in downtown, you can see just how deep it is here up to my thighs. Reporter watch how fast it covers this car in lockport, new york. One hour later smothered. Right now more than half the nation covered in snow. This time last year, only 27 . And tonight, more is on the way. So that lake effect had nothing to do with the snow that is now falling in parts of illinois and will speed overnight through the southern great lakes into the northeast. Let me show you snow totals printed out by one of the computer models, take this. Some of the areas just south and east of chicago could pick up close to a half foot. But chicago and south doesnt look like a whole lot. Go to the northeast, new york city start as snow late tomorrow morning and by evening change to rain, that will taper the totals, but go inland and upstate new york also interior new england, diane, we could be seeing over a foot. All this snow coming, just 12 days until christmas as you know, ginger. Thank you. At this christmas time we remember 42,700 u. S. Troops still serving in afghanistan on this holiday. And abcs Mike Boettcher spent more than two years embedded with some of them and brings us now a report as part of an abc news special campaign. Home for the holidays. Reporter seana arrechaga and her 5yearold son alston are getting their home ready for the holidays. I actually was really excited to put up my Christmas Tree this year. Reporter they have been living here less than a year before that fort campbell, kentucky was home. With this man, his father, her husband. I think about him every day. Ill never forget thinking about him. Reporter Army SergeantOfren Arrechaga was stationed in afghanistan, my son carlos and i were embedded with his battalion when he and his comrades came under attack. One of the deadliest fire fights of the war. We remember that smile. Everybody does. Sergeant arrechaga one of six killed. After, seana didnt want to live in their house any more, too many ghosts of ac, as everyone called him. Too many memories. I never wanted to leave that house. But i knew i had to. Reporter we reached out to the Charity Homes for our troops, and they went to work. Providing this newly renovated home free of charge. Its huge. Being here is amazing. Its like starting over. Reporter but this holiday season, that home, not the only gift for seana and her son. Hi. How are you . Good. How are you . Reporter this is Sergeant Mendez her husbands best buddy. I was a friend of your daddys. Reporter he tried to save him that day. This week he traveled to ohio to tell her something. I tried to get there as fast as i could. And im sorry that he didnt make it. Reporter the gift of healing, and of living in the present. Im going to watch my son grow up and put up the Christmas Tree for him every year and im learning to embrace life. Reporter Mike Boettcher, abc news, indianapolis. We hope youll join us, as we salute military heroes by going to our web site, and of course later there will be more tonight on nightline. And next here tonight, real money is back. Parking. How to change the way you park your car and put hundreds of dollars back in your pocket. And mary poppins taught us how to say it. Supercalifragilistic. We have the secret behind that song from the person of the week. Back in just two minutes. [ male announcer ] everyone deserves the gift of all day pain relief. This season, discover aleve. All day pain relief with just two pills. So i deserve a Small Business credit card with amazing rewards. 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[ chicken caws ] [ male announcer ] when your favorite food starts a fight, fight back fast with tums. Heartburn relief that neutralizes acid on contact and goes to work in seconds. Tum, tum tum tum tums and next here tonight, our Real Money Team is back, if youre doing Holiday Shopping this weekend, or driving to the airport, youll be in that amazing race for a parking spot. The average American Family spends almost 1300 a year on parking, more to park our cars than insurance and maintenance. Abcs paula faris shows you how to keep the money in your pockets. Reporter john and jennifer law are driving in circles spinning their wheels on the high cost of parking. Theyre dropping an eye popping 785 every month for work, appointments and events. Astronomical when you break down the numbers. Youre making me think about it. Reporter but our parking expert jeremy smith says parking shouldnt put the laws budget in overdrive. Tip number one, never pay full price, spot hero. Com is where we find a monthly spot for 30 less than what john is paying. Located just a few blocks from where youre going. Reporter if youre flying to grandmas house for the holidays check out the app Airport Parking discovers discounted lots that have free transport to the airport. Tip two, did you know rates fluctuate wildly from block to block . In chicago Downtown Parking was 42, but just five blocks south, only 13. Tip number three, when attending that big game or holiday concert, prepay on sites like park whiz. Com, they guarantee you a spot. Finally, find metered parking without driving round and round. How much time are you wasting . 20 minutes every time i come in. Reporter using an app called parker, find realtime parking spots in 40 cities. It says there is plenty of parking in this area. Two spots. Just like they predicted. In all, we estimate the laws can park over 2800 back in their pocketbook this year. Thats real money. Reporter paula faris, abc news, new york. 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Now its our best of the week instant index, everyone buzzing about beyonce and her friday surprise. But first, the other surprise for lucky passengers who made santas nice list. Heres abcs john donvan. Reporter instant index this week, west jet had santa talk to passengers and put together a list. I need socks and underwear. An android tablet. Reporter when the plane was in the air west jet sent the staff shopping. When the plane landed he got his socks and underwear and amazingly his android tablet. Nice stunt west jet. Reporter another stunt beyonce debuting her album this morning on itunes and only itunes called beyonce. Meanwhile, also performing, 4yearold gabriel die hard star wars fan, when the theme gets going, so does gabriel. In British Columbia watch these guys get going. Yikes. Watch again. Ben mar in the kayak, Rory Bushfield in the air both made it out alive. Back at calgary airport. These folks wished big before takeoff. When the gifts rolled a door opened and there it was. Thanks blue santa. Thats the instant index. Im john donvan. When we come back, the secret behind the mary poppins songs we know by heart. Our person of the week. A spoonful of sugar helps the medicine go down im here to say a few words about the power of baking stuff with nestle toll house morsels. You can heal a broken heart with a bundt cake. Make a monday mornin feel like a friday afternoon with some nestle toll house morsels. Lets close our laptops and open our ovens. These things dont bake themselves. We have to bake them for one another. We can bake the world a better place one toll house cookie at a time. Nestle. Good food, good life. Of using toothpaste to clean a denture. But dentures are very different to real teeth. Theyre about 10 times softer and may have surface pores where bacteria can grow and multiply. Polident is specifically designed to clean dentures daily. 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Side effects may include headache, upset stomach, delayed backache or muscle ache. To avoid longterm injury, seek immediate medical help for an erection lasting more than four hours. If you have any sudden decrease or loss in hearing or vision, or if you have any allergic reactions such as rash, hives, swelling of the lips, tongue or throat, or difficulty breathing or swallowing, stop taking cialis and get medical help right away. Ask your doctor about cialis for daily use and a 30tablet free trial. Or treat gas with these after you get it. Now thats like sunblock before or sun burn cream later. Oh, somebody out theres saying, now i get it take beano before and therell be no gas. And finally tonight, a spoonful of music history. In the new movie saving mr. Banks, we learn about the making of the classic film mary poppins and the songs we know by heart. Tom hanks plays walt disney, who is the founder of our parent company, and Emma Thompson, the prickly author of mary poppins, somehow, the song writers win her over with their music and one of them is Richard Sherman, who is now 85 years old. And hes our person of the week. Heres abcs nick watt. I wanna be like you reporter ever wondered who wrote this or this . Chitty chitty bang bang reporter how about this . Chim chim cheree this man wrote the soundtrack to your childhood. Absolutely. Reporter the man is Richard Sherman, who with his late Brother Robert fulfilled walt disneys dream of bringing mary poppins to the silver screen. He said, read this and tell me what you think. We cobbled together a concept. That got my heart racing when i saw it. Very touching that you like our songs. Reporter hanks plays walt disney in saving mr. Banks, theres Richard Sherman at the piano played by jason schwartzman. And Emma Thompson as mary poppins cantankerous creator p. L. Travers. We made it up. Well, unmake it up. Reporter travers didnt like americans, cartoons, movies, music, walt disney himself. She didnt like much. Every time i tried to sing something, she would just dismiss it. Reporter these are actual recordings of those painful sessions. It is integral to the book and to the story. In whatever form it is, that mary poppins will never be impolite to anybody. Reporter travers hated this. Supercalifragilistic reporter Julie Andrews can still say supercalifragilistic backwards. You can say it backwards. Yes, i can. And Julie Andrews is the first person to ever, ever, ever say that. It was her idea. And you let me put it in. Well, i was thrilled, i said, thank you, i wrote that. A spoonful of sugar helps the medicine go down reporter the movie was a phenomenal success. 50 years later, Richard Sherman still lives and breathes a happy tune. There you go. We gratefully choose Richard Sherman as our person of the week, and we thank you for watching. Remember 20 20 tonight and david muir will be right here all weekend. Hope you have a great one. See you back here on monday. Good night. Were live where water mains are bursting left and right. Tonight a deadly disappearance of a San Francisco hospital patient well. Know how she died and northern californias mostwanted terrorist. Tonight the fbi tells us where he might be and what he might be up to, now. Six water lines ruptured leaving a thousand homes without water. Repairs happening in these four locations Cornell Bernard is live with the story. Cornell that, is a huge mass hasel for people. It is. Repairs are comg back on across millbrae pechl have holiday parties scheduled and others just have dishes to clean. Theyre back in business, water flowing again. You know for a long time today the water was off. There is no water at joe gibbs house, most of it is rushing down his street. Woke to jack hammers and my wife asking what to do about there not being water. What are you doing about it . We have jugs of water stored for emergencies so were using those five water lines burst, leaving a thousand homes high and dry every available public utility worker is on duty. The mayor says the recent cold snap may have