you no good mother [ bleep ]. >> duane harper is a person that sometimes don't think before he reactsd you now. >> harper's current release date from segregation is in 2009. >> if you talk to a lot of cats that really, really know me, they'll tell you that i overreact. i let my anger and my, you know, things get to me that i shouldn't have, and as a result of that, i'm still here. >>> when we return -- >> i'm not going to live with child molesters. i'm not going to live with punks. i'm not going to live with rats. i'm not going to live with that kind of people, because i have a choice, because i have nothing to lose. >> we meet some of the castle's most notorious and violent inmates. >>> and later -- >> you've got a lot of time to examine yourself, think about the things that you've done, think about the opportunities you had in life and squandered them. >> voices from death row. we also have zero free time, and my dad moving in. so we went to fidelity. we looked at our family's goals and some ways to help us get there. they helped me fix my economy, the one in my house. now they're m

>> when we first met harper he was serving his third year in administrative segregation or solitary confinement for having assaulted correctional officers. >> in my opinion, duane is a really stressed out individual. >> don't just strip me out for talking. strip everybody out for talking you [ bleep ]. >> shortly after "lockup" arrived at kentucky state penitentiary, officers had to extract harper from his cell again. >> he threatened us with throwing feces on police officers, spitting on us through the door, he threatened our families. >> a lot of the older ones like lieutenant gill, all of them, they know me from when i was a youngster. so we have a different type of communication level and understanding. >> every night you are going to go through this. every night you work, you racist, redneck, no good [ bleep ] [ bleep ]. >> i know you is a coward -- >> harper will serve at least two more years in segregation. >> i made things hard for myself. i have been in segregation for three years. i don't blame nobody else. because i had an opportunity to get out of here. i let my anger and things get to me that i shouldn't have. and as a result of that, i'm still her