Everything stops around you. Everything. So youre in the second floor of the building. Tonight, recordings in real time from the crime scene. Unprovoked, hit in the face. From the interrogation room. To the courtroom. He was bullied, threatened, and attacked. With that gun in his hand, he was the most deadly person in sight. But was it self defense, or retaliation. You have been portrayed as a bunch of bullies. Everybody was hammered. What will the jury decide . What would you do . A chance encounter. Good evening. Im elizabeth vargas. David is away on assignment. When you were shopping around for colleges, you maybe thought about the schools academics, athletics, maybe even alcohol policy. But you probably didnt think about whether or not guns are allowed on campus. Tonight, one family says they wish they had, because it resulted in death, and a murder trial, with a new one scheduled for next month. Heres matt gutman. Reporter its motto is, the world looks different from here. And it does. Northern Arizona University sits 7,000 feet in the air. Surrounded by the snowcapped San Francisco peaks and a Ponderosa Pine forest here in flagstaff, arizona. Plenty of wide open spaces, for any kid looking to strike out on his own. Theres so much to do. You have sedona and the grand canyon. The mountains. Flagstaff is really homey if you will. Its got a comfortable, welcoming feel to it. Nau, same thing. I mean, flagstaff and nau, theyre not separate. Its just all one big community. Nau is one of three state schools in arizona. Its got about 20,000 students, but it has a very closeknit feel among the students on campus. Reporter one of those students who arrives as a freshman in the fall of 2013 is 18yearold colin brough. Here to study business. And how did he come to choose nau . He applied to csu, boulder and nau. And nau was the furthest away so thats why he picked that one. Because he wanted to be away from home, and just wanted to be on his own. Independent. Reporter claudia and doug drop him off, 10 1 2 hours away from their colorado home. Sure he will be safe. Looking around this campus, can you tell why he liked it so much . Well its a great community. Its a beautiful community. Reporter at first, it seems colin is suffering from the alltoo familiar Fall Freshman blues. He would always kid me, im not going to be homesick. I cant wait to go. Two months later, i think i made a mistake. I want to come home. Reporter but the jitters start to fade once colin begins making friends. Like fellow freshman nick piring. We became random roommates freshman year in the dorms. I met his family the first day, just became really close right off the bat. Reporter would you say hes your best friend . One of my best friends, for sure. We ended up rushing the fraternity second semester. Reporter kyle zientek also meets colin at that fraternity. Well, youre smiling, youre grinning, so. Just thinking about just the kids like heart, honestly. The smirk that he always had too just was, i dont know. That kid had something just about him. Reporter the boys join the Delta Chi Fraternity at nau. A school where greek life is big on campus. The people, the programs and of course the parties. Parties like this one, shot by an nau student. Thats the part that worries colins parents. What was your impression . I kept thinking, like animal house. cause thats all i really knew. Reporter that paints a picture. I wasnt happy about it. But i told him he could make those decisions. Reporter and that was your whole philosophy bringing up the kids, right . When youre in my house im going to take care of you, youre going to be safe, but when you go off to college. Youre going to explore, make choices that youre going to live by. Reporter by sophomore year colin and his friend nick move offcampus to this apartment complex known as the courtyard. Its a popular spot for delta chi, housing several of their Fraternity Brothers and is conveniently located just across the street from nau. We had the whole little courtyard so we could go out there, maybe, you know, just get together, play some beer games or something. It had sort of a reputation at the time for being a place to party and hang out. Police were often visiting the courtyard, getting noise complaints, getting complaints of students drinking. Reporter were you concerned that colin would go off to college and start just partying his face off . I was always concerned about that and of course i didnt like it. But i knew in the end he would get it out. Reporter but before he would get the opportunity to do that, Tragedy Strikes on campus. Nau has been in existence for 118 years, and for 116 of those years there had never been a shooting on campus. That changed on the night of october 9th, 2015. Reporter the night starts out like so many others, with a party at the courtyard. What are you guys doing that night . Were just hanging out. Just a couple people drinking, its thursday night. It wasnt anything crazy. Reporter do you guys even know what started everything . No, no, i dont know what happened and how it started. Reporter around 1 00 a. M. Nick and kyle along with several other people at the party say they hear what sounds like an argument going on in front of the courtyard. It wasnt a memorable night. Reporter zach volpo and nick pletke are also delta chi brothers who are at the party that night. Theres a verbal confrontation going on on the street. All of the sudden i see the group move into the parking lot, and then thats when i saw the flashlight flick on. Reporter do you remember ever seeing the gun . I remember seeing a light. I thought it was, Security Guard or a cop or something. Had no idea. I look down for a second, either at and all of the sudden i hear three, four loud, really, really loud bangs. I thought it was fireworks or something. Reporter zach runs across the street into the nau parking lot and hes horrified. Colin brough and nick piring are down. Both of them bleeding on the ground. Each of them shot twice. I was in so much shock, i had no idea. And so i saw a puddle of blood next to me. The only person i didnt recognize was the one standing, and i realized that he was the gunman. Immediately turned around, book it back, try to find some cover. I saw this blinding light, it kind of clicked with me that somethings not right. Reporter the shooter fires off several more rounds. This time hitting delta chi brother nick prato and kyle zientek. How do you get shot in the back . I turned around when i saw that light. Next thing i know, like, on the ground and its just, its like all numb. Reporter when we come back, how did a College Party turn into a war zone . As police arrive, they confront the teenage shooter. Body cameras capturing all the action. Can i call my mom . 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And nick piring is shot in the shoulder and the hip. I could see colin from where i was, and i was yelling 911, like, someone call 911. The parking lot where the shooting took place, theres a dormitory that overlooks it, and a lot of people had their windows open, so they could hear what was happening. Reporter so you are second floor up, second window in right there . Yes. Reporter okay, i mean thats as close as you can get. Thats within spitting distance. The gunshots were pretty apparent. Reporter miqui scollard, a sophomore at nau, jumps from her bed and runs down to the parking lot into a crowd she doesnt know with bullets still flying. You begin to see people on the ground here. Yes, and the first person i see is nick. Hes laying here and im like, where are you hit . Like where are you hurting and hes like my shoulder. I see his shirt, and hes got a pretty big bullet wound there so i put my left arm, my left palm on his shoulder. Reporter what miqui doesnt realize is that at this moment the shooter is still on the scene, right behind her. And before you know it there was more gunshots. Reporter so you literally administering firstaid to somebody who had been shot . Yes. Reporter and then you heard gunshots behind you . And i hear gunshots again and i said, hes still shooting. Dont move, dont scream. Reporter thats when the two Fraternity Brothers nick prato and kyle zientek were hit. Afterwards i remember looking to my left and the boys that i now know from the shooting were screaming, stop shooting stop shooting i remember one saying, he dropped the gun. He dropped the gun. Before you knew it, we had officers on all of us with guns in our faces. Code three. Reporter nau police begin arriving with body cameras rolling. Every second of the aftermath is caught on tape. Check that kid back there. Multiple victims. I am going to need three or four ambulances at least. Reporter this video shows the chaos still unfolding, the young boys bleeding, lying shot on the ground. Miqui scollard applying pressure to nick pirings wounds. And on the other side right there, a quick glimpse of frantic 18 yearold on the ground, but this one is being handcuffed. Turn around, on the ground, on the ground. Please go help them officer, please. Please. Please go help them, im so sorry, please. Please go help them. Help me. Im so scared. I have one detained. He identified himself as the shooter. Reporter the hysterical student on that body cam is nau freshman steven jones. He had only been on campus a few weeks. Im so scared. I want my mom. Is your name steven . Yes, sir. Have a seat. Its just a very, very raw moment which obviously he probably doesnt know hes being recorded. I have the suspect in the back of my car right there. You identified yourself to me as the only, as the shooter. Theres nobody else involved . No, nobody but me. I take all responsibility. Okay. Reporter officers begin securing the scene, searching through the nearby dorm, outside paramedics work to save the four badly injured College Students. I was just looking up in, into the sky. Just screaming at the sky. Reporter what were you able to see . I could just see colin like in the rocks at that point and just unconscious. I remember yelling at the paramedics to go help him. I guess there was nothing they could do for him. Reporter 20yearold colin brough lay dead on the ground. While his three Fraternity Brothers are raced to the hospital with multiple gunshot wounds. But in the back of that squad car the suspect steven jones isnt acting like a deranged rampage shooter, more like a distraught kid. Oh, my god. Reporter repeatedly begging for his mom. Im so scared. Can i call my mom . Well call your mom for you. We just got to figure all this stuff out first. Stand by real quick. Reporter 500 miles away in colorado, another mother and father are about to get devastating news. We really never talk about that day together. Reporter even to each other . Mmmm. Our youngest, doug, came down and he had gotten a text that theres a shooting at nau. First thing i did was text him. Reporter what time is this . 6 23 in the morning. Reporter you remember the exact time of day. Yeah. I called the flagstaff police, and they said the nau police were handling it. So i got to the nau person that was handling it and she told me colin had passed. It was just like a bad dream and i kept thinking, this isnt real. Like, this isnt this cant be. Reporter and then whats your next move . Do you try to fly right away to flagstaff . You dont move. You yeah. You dont move. Everything stops around you. Everything. Reporter while claudia and doug brough descend into a paralysis of pain, the community of flagstaff is reeling, trying to understand how this could happen here and why. Did you know at the time, that night, that it was a student . No. Reporter that had done the shooting . I had no idea. Reporter but it is a student, and when hes led into a Police Interrogation room cameras continue to roll. The college freshman, with blood on his hands, literally. But was the terrified teenage gunman actually fighting for his own life . The story he tells police, and the blurred lines between murder and selfdefense, up next. Its all that stuff. In a house that you own. Because homeownership . Thats as american as ditching the metric system. You think we put men on the moon so future generations could say buying a house seems hard. We dont think so. So we wont rest until we fulfill your domestic destiny. I mean, well sleep. But not that soundly. As women, we need to take time to be active. Thats whats so amazing about poise® impressa. Its so easy and its so comfortable. It helps you stop bladder leaks, padfree. I can wear this nice dress and i dont have to wear a pad now. Try impressa® today, and start living comfortably padfree. Haribo sour goldbears . 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This was different. Reporter the shooter is 18yearold steven jones. He identified himself to police at the scene. He had only been on campus about three weeks. School had just started. Hed grown up in a middle class family, suburb of phoenix, homeschooled by his mother, was having some trouble apparently adjusting to college but was just beginning to make some friends. Just have a seat over there in that chair. Reporter the distraught teenager is led into a tiny interrogation room, still handcuffed. Can you put my hair out of my face, please . Reporter shaken. And when hes finally able to see the blood on his hands, horror at what they have allegedly done. Put your hands together like this. There we go. Perfect. Tight. What happened tonight . I dont think i should answer that without calling my dad first. Reporter at first reluctant, steven begins to describe a night that started out pretty tamely. He and some friends at another students place off campus. There were girls and the video game guitar hero. Did you guys imbibe on any alcoholic beverages . The girls were. They had beers. I had a sip of my friends beer but i knew that i was driving and i couldnt afford to. Reporter jones says after about a half an hour, he and three of his freshmen buddies jacob, shay, and hunter, want t