j.d. salinger and "catcher in the rye" did not cause me to kill john lennon. in fact, i wrote j.d. linger i got his box number from someone, and i apologized to him for this. >> in october 1980, chapman turns his resentment against phonies towards john lennon when he reads an article about the upcoming release of "double fantasy." >> this thing when i got angry at lennon. you're familiar with the dakota. it's a very nice building. seeing him on the dakota, i'm angry and i say to myself, that phony, that bastard. i got that mad, i took the book home to my wife and i said look, he's a phony. >> this is his calendar from december of '89 to december of '90. it leads you all the way through his manic months before lennon's death. >> writer jim gaines spent hundreds of hours between 1984 and 1985 interviewing mark chapman. >> and you can see it becomes crazier and crazier with crossings-out and things to do. >> chapman told gaines that for years his mind had been like a war zone. occupied by opposing forces he described as the big people and little people. >> he had a whole population of