Overview: Was Lee Harvey Oswald a mentally disturbed gunman acting alone, as the report of the Warren Commission suggested? Was he one of two gunmen, as the House Select Committee on Assassinations concluded? Or was he, as he claimed, an innocent fall guy? This Timewatch investigative biography sifts through the mysteries of Oswald's life, from his troubled childhood and his Marine service to his dramatic defection to the Soviet Union in 1959 and his return to the USA.