ATTICA, New York (AP) -- John Lennon's killer was denied parole for a fourth time Tuesday because of the "bizarre nature" of his crime. Mark David Chapman, 51, must remain at Attica Correctional Facility for at least two more years for gunning down the former Beatle outside his Manhattan apartment building in 1980. "The panel remains concerned about the bizarre nature of this premeditated and violent crime," the board wrote in a one-page decision issued shortly after Chapman's appearance before the three-member panel at Attica.