Dzhokhar Tsarnaev: American College Student

The Boston Marathon bomb suspect's shocked friends and classmates speak out.
3:45 | 04/20/13

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Transcript for Dzhokhar Tsarnaev: American College Student
There is a chilling now iconic image that shows nineteen year old Joseph cars are -- standing behind. Eight year old Martin Richards moments before the bomb Joseph -- is said to have planted and his feet went off. But won't -- doing while the world reeled from the -- tragedy. And authorities began an all around the clock search today I met with a friend of his who actually saw him and talked with him. After the bombing. Andrew lust he woke up this morning at his dorm and UMass Dartmouth to the screech -- a fire alarm. Mean my remaining -- -- about the same time music what was going on what's going on. As Blackhawk helicopters flew overhead police went through the building telling students to leave now it's not safe. I didn't have time to grab my wallet on the phone late -- -- -- title -- grabbed my sweatpants and my. Jeans and sneakers. Turns out to cars aren't ahead the most wanted fugitive of the country was living just one floor above him you sat next to and psychology. As guests are excellent and it was he studious was -- Not paying attention he would most recent years. Even more chilling -- says he had a conversation with the target of a massive manhunts. One full day bombing. Wow thank. He had the walls to come back in just the Iraq we'll take you -- they have in the. That's how we -- -- that so reactive not. -- does not nervous. -- -- the alleged bomber went back to normal campus life just a day after allegedly committing a terrorist attack card swipes at UMass Dartmouth -- that he went to Jim and slept in his dorm two full days after the bombing not behaving like a fugitive from the law but trying to blend right back into his normal life how convincing was -- on Tuesday to you. That that nothing was. He was he was so convincing I thought as -- -- rules aren't like we had typical conversation. He was not startled he was not scared he was not anything injuries -- job. That sentiment was echoed by other people who knew him Chris -- wrestled against him and they were friends at UMass Dartmouth. -- was one of the nicest kids. Ben and that every single time I -- -- he'd make sure to say hi. He lose the very calm relaxed all the time. For people who knew there were no warning signs -- describes an average college sophomore who played intramural soccer enjoyed fifa soccer video games. And smoked a lot of marijuana. How often do you think he was doing. Probably. Every day but he said this year it is spoken -- as much. -- I think he told me from one of our policy -- that allows smoking. Two friends on campus he was a social yet low key guy with a messy dorm room. Who -- -- pop music friends never heard him talk about radical politics or religion. But authorities believe the ethnic section fully assimilated immigrant lived a double life but he's. Really makes -- like the person next team. They really that person they act like they're really -- person but instead they're -- people. -- says Joseph -- told his car was fixed which he described as a green Honda Civic even offering to drive him home to Waltham on Friday. Casually asking that he couldn't get it right on the Walton in again -- -- you. So he offered to give you ride home today yet today outsourcing interaction with the. Instead he's in custody tonight accused of committing the worst terrorist act on US soil since 9/11. And authorities say we can all sleep a little bit easier tonight.

This transcript has been automatically generated and may not be 100% accurate.

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