A Secret Service agent, he leaped onto the president’s limousine in Dallas in 1963 and was credited with saving the first lady’s life. But he was haunted by his inability to save her husband.

The Secret Service agent who leaped onto the back of President John F. Kennedy's limousine after the president was shot has died. Clint Hill was 93.

Mr. Hill dove onto the presidential limo in a vain attempt to save President John F. Kennedy when he was assassinated in Dallas in 1963.