History's Mysteries - A Question of Conspiracy: The RFK Murder (History Channel Documentary)

On June 5, 1968, presidential candidate Robert F. Kennedy was mortally wounded shortly after midnight PDT at the Ambassador Hotel in Los Angeles. Earlier that evening, the 42 year-old junior Senator from New York was declared the winner in the South Dakota and California presidential primaries in the 1968 election. He was pronounced dead at 1:44 AM on June 6, about 26 hours after he had been shot.

Summary from Wikipedia