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In recognition of the 40th anniversary of the assassination of U.S. President John F. Kennedy, ABC News anchorman Peter Jennings reexamines the theories about what really happened on that fateful day in Dallas, TX. Along with experts and historians, Jennings looks at evidence, including the legendary eight-millimeter home movie of the shooting that was captured by bystander Abraham Zapruder, to determine if Lee Harvey Oswald acted alone or was a simple cog in a complex conspiracy. And if there were others involved, just who exactly were they?