Wed Apr 2, 6:07 PM ET

Three-year-old John F. Kennedy Jr. salutes his father's casket in Washington in this Nov. 25, 1963 file photo, three days after the president was assassinated in Dallas. Widow Jacqueline Kennedy, center, and daughter Caroline Kennedy are accompanied by the late president's brothers Sen. Edward Kennedy, left, and Attorney General Robert Kennedy. (AP Photo/File)

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