James Garfield--The 20th President, who was assassinated in 1881. Garfield was shot by Charles J. Guiteau, a disgruntled office seeker, at the Baltimore and Potomac Railroad Station in Washington, D.C. on July 2, 1881.
Guiteau had supported Garfield in the election, and he believed that his work in the campaign justified him being appointed as American consul in Paris, France. This despite the fact that he was unqualified for the job and did not speak French. Guiteau convinced himself that he was turned down because he was a member of the faction of the Republican Party known as the Stalwarts, and that Garfield had betrayed him because for political reasons.
After shooting Garfield, Guiteau was taken into custody and readily admitted and detailed his whole assassination plot and reasoning for killing Garfield. The president lingered on for twelve weeks, finally dying of his wounds on September 19, 1881. Modern doctors believe that had Garfield's doctors had access to modern medical procedures and equipment, he likely would have survived his wounds. Garfield was succeeded by Vice-President Chester Arthur.