>> when the defendant entered the guilty plea, i was disappointed by that fact, i was looking forward to the opportunity to prove the facts that we had assembled in a public trial. >> mark david chapman was sentenced to 20 years to life, and sent to the new york state penitentiary at attica. in his interview with larry king, chapman claimed to have recovered from the mental illness that had led to his crime. >> it was me, larry. and i accept full responsibility for what i did. i have seen places where i am blaming the devil, and i hope that isn't kept going after this interview. i'm not blaming the devil. i'm blaming myself, but in a major sense, it wasn't me because i'm better now. i'm sorry for what i did. i realize now that i really ended a man's life. i just saw him as a two-dimensional celebrity with no real feelings. he was an album cover to me.