William McKinley
McKinley was shot by an anarchist named Leon Czolgosz on September 6, 1901. His abdominal gunshot wounds became infected and resulted in gangrene. He died eight days later and Czolgosz said that the President committed war crimes in the Philippines and was an enemy of the people. Czolgosz was executed in the electric chair on October 29, 1901. McKinley was the third American president to be assassinated.