Paul Landis was one of two Secret Service agents tasked with guarding first lady Jacqueline Kennedy on November 22, 1963—the day President John F. Kennedy was assassinated. In a new book, The Final Witness, to be published in October, Landis claims to have seen something that afternoon that he had never publicly admitted before. His secret, coming to light only now, will certainly reorient how historians and laymen perceive that grave and harrowing event. His account also raises questions about whether there might have been a second gunman in Dallas that day.

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