A former member of JFK's (left, moments before he was killed) security team known simply as 'Ron' told Oliver Stone of how one of his team members killed the president in November 1963. Dying from cancer, the ex-agent known only as 'Ron' wanted to share a secret he had only told his son. Stone (top right, on the set of JFK with Kevin Costner), who directed an Oscar nominated biopic about the president, said he was convinced by his 'military jargon' and intricate detail. Lee Harvey Oswald (bottom right) was accused of shooting the president from the sixth floor of the Texas School Book Depository before he was shot dead two days later.   EXCLUSIVE - 'JFK assassination was an inside job': Ex-government agent claimed 'someone from his team' killed the president in remarkable deathbed confession to director Oliver Stone