In this November 22, 1963 file photo, the limousine carrying mortally wounded President John F. Kennedy races toward the hospital seconds after he was shot in Dallas. Secret Service agent Clinton Hill is riding on the back of the car, Nellie Connally, wife of Texas Gov. John Connally, bends over her wounded husband, and first lady Jacqueline Kennedy leans over the president. (Photo by Justin Newman/AP Photo/File)
