. >> for johnny estrada, the warnings turned into reality. >> when you're in prison you learn a certainmentality. and that was my mistake when i got out. i took that mentality that i learned in here out there. and it didn't get me nothing but back here. >> here is colorado state penitentiary. this time, estrada is in for murder. a crime he committed after being released from his first prison term. >> in here you take things a lot more serious, somebody calls you a punk, something calls you a bitch, somebody says i'm going to till you, in here, that means, you know, you hold people to that word, to them words then. when i got out and them guys were saying that about me, i'm going to kill john, i'm going to do this to them, the first thing in my mind is i better kill him before he gets me, you know? even though he was probably talking out of his ass. he didn't understand the type of person i am and where i've been and the thought process i've learned in here. and he's dead now for it. it's kind of like a kill or be killed. >> estrada's prison education started early. >> how old were you w