reggie matias, felt he was capable of doing something few predators are capable of, changing their ways. >> we wanted to try to figure out a different way to do his time in prison, and so he talked with me when he was up on the segregation unit and he said, you know, i really want a chance at the rtu unit. i want to start making changes in my life. you know, we're pretty particular about who we take in. the bottom line on this unit is that there can be no violence. >> i think this unit is the vehicle that i've been waiting for. i think that i'm ready for it because now that my system is beginning to settle, this will be the best time to capitalize off this moment. >> remember, you're trying to change your past. right? you've been going down a certain road for many years and you're trying to walk a different road. >> right. >> do your time a little differently than you have in the what, last eight or nine years? you're going to be one of our stars. >> that's right. >> i know that. i know that. okay? >> i can come up here and i can get my stuff together. so i won't have to relapse back in

>> prison psychology reggie matias is called in to calm gonzalez down. >> you're going home friday, right? >> yeah. friday is my out day. i want to hurry up and make it out there before i do end up doing something stupid knowing i will regret it later on down the line. >> i was getting a little worried about you. the closer it gets to your date, the more worked up you seem to be getting. >> i'm glad you noticed that. i'm nervous, man. don't get me wrong. i'm really happy to be out there with my family again. you know? i'm not trying to get in trouble to purposely stay here. that's not what this is about. it's not purposely. it's just how i am. >> it's a big change. >> i want to get the hell out of here as soon as possible. i can't wait. >> gonzalez is not the only cutter at isp who's under stress. after less than a week of living in a general population dorm, john philbeck ran into a problem with another inmate and was moved back to the residential treatment unit. when he got there, more trouble was waiting for him. >> dude jumped me as soon as he opened up the door. >> just turn around.

. >> prison psychologist reggie matias hopes steele will be well enough eventually to be transitioned to a less restrictive unit. >> we have a program where they work in general population, they do that for a week or so, maybe two. if it looks like it's going well, then they'll move them up to a dorm and they can go to work from there. essentially they would be discharged from the chronic care unit. >> i heard you've been doing much, much better these days. >> i'm trying to. >> yeah, good. the plan is as soon as you get back to your usual self, we'll get you back out there working. you worked in the kitchen, right? >> yeah, i worked in the kitchen as a cook. >> i heard you were popular. >> i'm the best cook over there. >> that's what they said. they said the food was good. >> that's because i have a passion for cooking. >> but when the subject of getting a job in population arises, steele suddenly changes his tone and accuses the doctor of deceiving him. >> you lied to me so much in the past out there in population, that i don't know if i can trust you. >> i understand. now things loo

reggie matias, as he was making his way to visit an idu inmate who was hoping to work his way out. >> part of the charm of the indiana state prison. it's like a ride at disney land. >> the inmate dr. matias is meeting is brian collins who is serving 60 years for a variety of charges. including rape. >> that dude you're talking to should be on "to catch a predator." he shouldn't be on "lockup." >> collins had a history of violence in prison as well. he once stabbed an inmate nine times and spent the last 7 1/2 years in the idu. now after a period of good behavior, he's requested a move to the chronic care unit. a steppingstone toward general population. >> you've done a lot of time in seg, and i don't know, maybe it's inevitable that you'll end up having to do more time in seg. >> i hope not. >> i keep trying to create situations for you so that it can be different. >> i've done a lot of violent things. in prison when you do violent things, it comes back to you. can't get away from it. >> dr. matias fears that if collins makes the move he might run into at least one of his old enemies.

reggie matias as he walked that fine line on a daily basis. >> i didn't do it. i'm innocent. me out. i was framed. >> one of the most notable things about dr. matias was his sense of humor. he was a very funny guy. >> it's the only way i keep myself sane. i go from one thing to another. so i have to use humor. >> we followed dr. matias to the prison's residential treatment unit, where inmates with varying levels of mental illness are housed. a number of them cope with the stress of prison by cutting themselves. >> knock knock. >> what's up? >> nothing much. how are you? >> how are you? >> he had a very gentle way of dealing with the inmates. even with the inmates who had done something he wasn't very happy about. >> when did you cut? yesterday? two days ago? what's today, friday? thursday? so wednesday? >> yeah. >> that was after group? >> yeah. >> come here. >> it's not bad, though. >> let's see. well, that's -- that's bad enough. let me ask. you know the stress was building up and you felt the tension. it clicked in your head that you should ask for me, talk to the mentor?