Clint Hill, the former US Secret Service agent who leapt onto President John F. Kennedy’s limousine to shield Jacqueline Kennedy during the 1963 assassination in Dallas, has died at 93. Hill’s quick actions became one of the most memorable moments of that tragic day. Despite his heroism, he struggled for decades with guilt over not saving the president. His career spanned five US presidents, and he later co-authored books on his experiences. Tributes have poured in, honouring his service and bravery.