>> this is the voice of a murderer, the voice of the man who killed john lennon. >> if you'd had told me a year previous you were going to murder someone, anyone, i would say, my goodness, there's no way. >> i honestly never met someone as out of touch with reality as he was. >> was he crazier than you thought? >> he was a lot crazier than i thought, yeah. >> journalist jim gaines spent hundreds of hours with mark david chapman at attica prison