. . . . . . . "Mark David Chapman's" . "Mark David Chapman" . . . . . . . . . . . . . . . . . . . "the very guy" . . . . . . . . . . . . . . . "Mark Chapman's" . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Mark David Chapman" . "Mark Chapman" . "Mark David Chapman#Early life and education" . . . . . . . . . . . "1955" . "an obsessed fan" . . . "deranged gunman" . . . . . . . . "delusional Christian fan" .