. >> chris walter, a registered nurse, and his brother james, a psychiatric technician work with the mentally disordered offenders. >> one of the main reasons that these guys are in here is that the mental illness played a major part in the crime that they were originally convicted on and a huge part of that is violence. the crime was considered violent or had an element of violence within it. >> in my mind i had already wished her dead so many times. you know, and the only thing that held me back was my dad, i knew that how disappointed my dad would be. >> richard guest was convicted of killing his stepmother when he was 16 years old. he was tried as a juvenile and served seven years in the california youth authority. >> my dad used to do everything she wanted. you know, it was like she was manipulating him. and whenever he was not, there i would get abused by her, and so i told myself, i am going the kill her. you know, and i don't care what happens to me. now that my dad is dead, i am going to kill her. and that is what i did. and i went over to her house, and i shot her. >> since