According to the NY Times, President McKinley was shot today by anarchist Leon Czolgosz at the Pan-American Exposition in Buffalo, N.Y. in 1901. Here's a related picture from our collection.
The Hospital Corps Men who served as the male nurses of President McKinley until his death. Private Ernest Vollmeyer, Acting Hospital Steward Palmer A. Eliot, and Private John Hodgins. Photographed at the Pan-American Exposition, Buffalo, NY, 1901. CP 2459