>> their stories share a ♪ >>> the wabash valley correctional facility in indiana houses a large numbertes who are or were considered mentally ill at the time of their crimes. >> come back here. >> when "lockup" visited there, we met two such inmates. they killed after their own minds turned on them. and their murders took on dimensions that were not only shocking, they were unimaginable. >> my name is howard franklin street jr. i'm 38 years old. i've been down since 1993 for shooting my mom. >> during our first day of shooting at wabash, our "lockup" crew met frank street, an inmate housed in the prison's residential treatment unit. at the time of the interview, street was experiencing involuntary tremors due to his medication. >> i started having delusions that people were out to hurt me. and i had this video cassette tape of a party and showed people hurting me, you know. and i showed it to my parents, ain't nothing to it. i thought you guys were crazy. they were thinking sane, they were sane. i was the crazy one. >> a short time later, street's delusions got the better of him. >> i

wabash, indiana. it had been two weeks since larry hall recoiled from a photo of jessica roach.y miller had a gut instinct. >> i really think we're on to something here. this guy portrays this weak, timid person, but, you know, i don't think he truly is. >> miller thought hall was vicious and as the investigation unfolded, miller also thought he knew how hall abducted jessica roach. >> when he first seen her, she was riding from -- toward the house, going down this way. >> hall followed and stopped to talk. jessica got scared and backed away. >> that's when he opens the door, grabs her. there's a physical confrontation where he overpowers her. put her in his van. and left. probably going up this road right past her house. >> in an interview in the wabash police station, hall surprised investigators by explaining what happened next. "i tied her up, but i can't remember with what. i took her pants off." hall said he raped her and led her off through the woods. i laid her up against a tree and put a belt around her neck and she stopped breathing. hall said he strangled jessica from

when we visited indiana's wabash valley correctional facility, officers in the security housing unite latest in a string of violent incidents involving convicted burglar, douglas mccombs. >> since he's been inside the shu, he's been on strip cell. when you see the offender coming out of his cell only wearing his underwear, at that time he was on a strip cell. i think at that time it was for resisting staff or trying to assault staff before. we have had trouble with him on about every range we've put him on so far. >> i can't get along with people too much. especially when they're evil. >> one of the people mccombs claims was evil, officer sachen. >> an average day in the shu can be pretty mundane. you have recs and showers to do. chow to serve, md sick call, so on and so forth. some days like today get a little more exciting. we had an offender who became belligerent in the shower. >> the offender was mccombs who told us he had good reason to be upset. >> try to get me to take a shower. but they don't have no soap or nothing. i said, ma'am, i just came from the other side, it was nas