|“||We choose to watch Doctor Who in this decade not because it is easy, but because it is hard.||”|
— JFK's speech at the commencement of the first /who/ general.
John "Jack Harkness" Fitzgerald Kennedy, also known as JFK or "There's this friend I have", was president of the United States right up until Doctor Who started. The day before it was set to premiere, he committed suicide by self-ordered assassination rather than live in a world where Doctor Who was allowed to air.
Relationship with the Program
One of the Virgin authors revealed he was, in fact, the assassin, apparently?
Doctor Who: Born with John F. Kennedy, died with John N. Turner.