How did The Catcher in the Rye influence mark Chapman?

Mark Chapman was actually a big fan of John Lennon. When he read Catcher in the Rye. He felt so connected to the main character Holder Caulfield and he saw similarities. H felt as if Lennon was a phony himself and Chapman shot him.

And Chapman actually followed the steps of Holden before killing Lennon. When they took him away in court, Chapman read aloud from the Catcher in the Rye.