Ray Zakovich, 90, said he was very sad to hear of his former boss Clint Hill's passing, calling him the ultimate professional.

Clint Hill, who was seen in film footage of the assassination scrambling across the back of the presidential limousine, died at his home. He was 93.

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