John F. Kennedy
From Tardis Wiki, the free Doctor Who reference
John Fitzgerald Kennedy, known also as "JFK", was the thirty-fifth President of the United States of America on Earth from 1961 to 1963.
Kennedy was assassinated on November 22, 1963 due to the Comet Nemesis passing over Earth. (DW: Silver Nemesis) The Doctor was present that day and was in the crowd when the assassination took place. (DW: Rose) The Master plotted to prevent Kennedy's assassination, but was thwarted by James Stevens. (MA: Who Killed Kennedy)
A manniquien of Kennedy, along with those of other historic figures, was included in a display at Madame Tussaud's. (DW: Spearhead from Space)