John F. Kennedy

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The eternal flame shines in the early morning light at the grave of John F. Kennedy at Arlington National Cemetery on Friday, Nov. 22, 2013, on the 50th anniversary of Kennedy's death. (AP Photo/Jacquelyn Martin)

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President John F. Kennedy is seen riding in motorcade approximately one minute before he was shot in Dallas, Tx., on Nov. 22, 1963. In the car riding with Kennedy are Mrs. Jacqueline Kennedy, right, Nellie Connally, left, and her husband, Gov. John Connally of Texas. (AP Photo)

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National Edition News Cover for November 22, 2013 - 50 years later, Kennedy death still haunts: President John F. Kennedy is seen riding in motorcade approximately one minute before he was shot in Dallas, Tx., on Nov. 22, 1963. In the car riding with Kennedy are Mrs. Jacqueline Kennedy, right, Nellie Connally, left, and her husband, Gov. John Connally of Texas. (AP Photo)

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This image provided by Warner Bros. from Oliver Stone's 1991 movie "JFK" shows a recreation of the assassination of U.S. President John F. Kennedy in Dallas. "This murder in broad daylight ... Everything changed," says Stone, the Baby Boomer director who served in Vietnam and made a movie about it before turning his critical lens on the Kennedy assassination. (AP Photo/Warner Bros.)