One of the most prominent figures associated with the assassination of President John F. Kennedy has died: Clint Hill, the Secret Service agent who jumped onto the back of the limousine moments after shots rang out in Dealy Plaza. Those who knew him tell CBS News Texas that Hill never really overcame the guilt he felt on that tragic day.

His attempt to shield the Kennedys from further harm became one of the most iconic moments in U.S. history. Despite receiving commendations for his bravery, Hill carried guilt for

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.