j.d. salinger and "catcher in the rye" did not cause me to kill john lennon. in fact, i wrote j.d. is 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 started with the dakota, i'm angry at seeing him on the dakota. 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 '79 to december of '80. it leads you through the manic months before his 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, his mind had been like a war zone occupied by opposing forces he described as the big people and the little people. >> he had a whole population of little people living in his head. to whom he gave instructions who had meetings about what his activiti