Quote Originally Posted by Quietus
The guy actually claimed that 'God' instructed him. Also, there are theories abound saying that John Lennon's murder (or assassination) was a result of a conspiracy.

One good point is that Chapman met Lennon about 6 hours earlier and asked for an autograph but he didn't kill him.
edit: Sorry. The plea was God's decision (his claim) but not the Murder. At least not from what I've read.