On this day Sept. 6 in 1901 President William McKinley was shot and later died on Sept. 14. McKinley was at the Pan-American exhibit in Buffalo, N.Y. when a man named Leon Czolgosz approached McKinley and shot him twice in the chest. When McKinley collapsed after being shot, he was to be found saying, “Be careful how you tell my wife.” Czolgosz intended on shooting a third shot but was tackled to the ground by McKinley’s bodyguards; McKinley told his bodyguards to hurt the assailant.

McKinley was sent to the hospital to perform surgery where they found two bullets in his chest. By Sept. 12 he had seemed to be fine, but the next days soon proved them wrong. McKinley had gotten worse, and by Sept. 14 he had his last breath. 

Soon after Czologsz’s arrest, he confessed to his crime by saying, “I killed President McKinley because I done my duty. I didn’t believe one man should have so much service, and another man should have none.” 

During the trial Judge Truman C. White ignored Czologosz’s attempt to plead guilty. Czologsz was given the death penalty after 30 minutes of deliberation and was sent to Auburn State Prison in Auburn, N.Y. where he would later be killed by electrocution on Oct. 29, 1901. Before being put in an unmarked grave, his body was covered in sulfuric acid. Czolgosz regarded McKinley as a symbol of oppression and believed it was his job to kill him: “I killed the president because he was the enemy of the good people – the working people,” being Czolgosz last words. 

Source: https://www.history.com/this-day-in-history/president-william-mckinley-is-shot 

https://www.britannica.com/biography/Leon-Czolgosz