Actor and film director Rob Reiner has claimed there were four shooters involved in the murder of President John F Kennedy and insists the reason the first bullet missed is key to his theory. 

Kennedy was shot as his open-top motorcade rolled through Dallas, Texas, on November 22, 1963 and he was pronounced dead after arriving at the Parkland Memorial Hospital. 

Official investigations concluded that he was assassinated by lone gunman Lee Harvey Oswald from a sixth floor window of the Texas School Book Depository.