A US Secret Service agent who leapt on to John F Kennedy's limousine as it came under fire in Dallas, and was pictured in famous photos of one of the most dramatic events in US history, has died at the age of 93.

Clint Hill, the Secret Service agent who leaped onto the back of President John F. Kennedy's limousine after the president was shot, then was forced to retire early because he remained haunted by memories of the assassination, died Friday. He was 93.

Clint Hill, the Secret Service agent who jumped onto the back of a limousine carrying President John F. Kennedy after he was shot in Dallas in 1963, has died. Hill died Friday at his home in California at the age of 93.