Jack Ruby

Jack Ruby worked for the Central Intelligence Agency. Ruby shot and killed Lee Harvey Oswald, the man suspected of assassinating President John F. Kennedy on 22 November 1963, soon after his arrest (PROSE: Untitled) which occurred as late as 23 November. (TV: The Cambridge Spy)

Behind the Scenes
In real life, Ruby shot Oswald on 24 November and never worked for the CIA.