* William Henry Harrison died of pneumonia in 1841, just one month after taking office.
* Abraham Lincoln was assassinated by John Wilkes Booth in 1865, five days after the end of the American Civil War.
* James A. Garfield was shot by Charles J. Guiteau in 1881 and died of blood poisoning two months later.
* Warren G. Harding died of a heart attack in 1923 while on a speaking tour of the Western United States.