Few events have shocked a generation more than the murder of President John F Kennedy on 22nd November 1963 in Dallas. Young and charismatic he seemed to promise a new beginning for America and the world, and within hours of his death theories about who had killed him abounded. These were not stilled by the Warren Commission’s assertion that there was a single gunman, and this programme looks at some of the other possibilities - such as the Cubans, big business, the Mafia, the KGB.