mark david chapman has plead guilty by reason of the insanity to the killing of john lennon. to the sr. prize of everyone in the courtroom, chapman pled guilty and was sentenced to 20 years to life. he never stood trial. my reaction was disappointmentment. i was disappointed because i thought that there were lessons to be learned for this case. lessons that ken holgrief still cites to this day. the most common impression that one gets when you hear people talk about the murder of john lennon is they refer to a crazed beatle fan. he wasn t crazed. but you re saying a trial would have proved that this was not about a crazed john lennon fan. correct. this guy was a killer and he was going to kill anybody just to become famous. yes, he is guilty of a heinous murder. do you think that he would kill again? i think it is possible. you never know what is going to happen.