Assassination of John F. Kennedy Service follow-up car and its driver's left arm, as well on the motorcycle officers who were riding on both sides of the President just behind his vehicle. Secret Service Special Agent Clint Hill was riding on the left front running board of the follow-up car, which was immediately behind the Presidential limousine. Hill testified that he heard one shot, then, as documented in other films and concurrent with Zapruder frame 308, he jumped off into Elm Street and ran forward to try to get on the limousine and protect the President; Hill testified to the Warren Commission that after he
Timeline of the John F. Kennedy assassination filmed jumping off his follow-up car at the equivalent of Zapruder frame 308; about a quarter of a second before the president's head exploded at frame 313). Hill then rapidly ran towards the Presidential limo and then another shot hit Kennedy in the head, cracking open the right side of his skull. As the limousine began speeding up, Mrs. Kennedy was heard to scream and she climbed out of the back seat onto the rear of the limo. At the same time, Hill managed to climb aboard and hang onto the suddenly accelerating limo, and Mrs. Kennedy returned to the