In American history, four presidents have been assassinated while in office. Chances are you are well familiar with John Wilkes Booth - the man who murdered Abraham Lincoln. You undoubtedly know another three named assassin - or alleged assassin depending on your point of view - Lee Harvey Oswald. But the two others are largely unknown. Charles Guiteau, the man who shot down James Garfield in 1881, and Leon Czolgosz, who killed William McKinley twenty years later.
We tell his story in this web extra: