Andrew Jackson killed one man in a duel on May 30, 1806. Charles Dickinson insulted Jackson, accusing him of cheating on a bet, calling him a coward and calling his wife Rachel a bigamist. Dickinson then went public with his accusations of Jackson.
Jackson was known to have a temper. He participated in a number of duels in his life, but only this one ended in a fatality. In this particular duel, Dickinson fired the first shot and hit Jackson close to the heart. Jackson fired back and, according to the History Channel website, witnesses say he misfired. Ignoring duel etiquette, he fired again and killed Dickinson. He did not face criminal charges for the death, but suffered physically from the wound for the rest of his life.