this is a guy who was not happened often. violent. his violence for how many and we were terrified of our minutes was he violent? in terms of predicting is he a mother. changed man? we were terrified of her. i don't think that's the question. with my mother, there was a lot the question is, is his illness of abuse with my adoptive mother. >> on the day you decided you controlled? were going to kill them, you is he being treated in prison? were playing various musical the man himself, if you look at the trajectory of his life, is not a violent man. records. >> what's fascinating about the one that was key to this was these recent shooters, if you look at james holmes in aurora, a song called let the bodies hit the floor, a song called bodies. adam lanza at sandy hook and you go back to tucson and others, what was going through your head these are young men, as i said as you heard that music? ♪ let the bodies hit the floor, earlier, disenfranchised they feel by society, who flip and let the bodies hit the floor ♪ commit these outrages. >> i had been listening to the song for a year non-stop and i he's another one, joshua cooke, had so much hate and rage inside that calls into that category. of me, i knew it was leading to do you believe that they can murder. just grow out of, this even if so the song "bodies" from they have a condition like schizophrenia? >> well, to some extent we do know that people are at their "drowning pool" was similar to violent peak early adulthood and many do grow out of it. the video games, made me feel