Lee Harvey Oswald

 assassinated President John F. Kennedy.

On 22 November 1963, the Ninth Doctor was photographed in Dealey Plaza in Dallas. President Kennedy passed within a few feet of him an instant before being fatally shot by Oswald. (TV: Rose; WEB: Defending the Earth!)

On 23 November, the front page of the Daily Standard reported the capture of Oswald. (TV: The Cambridge Spy)

On 23 November 1988, the Seventh Doctor asserted to Ace that Oswald was influenced to kill Kennedy by the Nemesis comet. (TV: Silver Nemesis)

Behind the Scenes

 * In Asylum of the Daleks, two guest characters were Harvey and Oswin Oswald.
 * Doctor Who premiered with An Unearthly Child on 23 November 1963, the day after Lee Harvey Oswald killed President Kennedy.