William McKinley was a Republican president when Republicans were still sometimes good. Before becoming president McKinley fought on the side of the Union during the Civil War leaving as a major. McKinley later was twice elected governor of Ohio.
He introduced protectionist tariffs which were popular in the United States at the time. McKinley started a war with Spain which liberated Cuba from Spanish rule but also took over Guam, The Philippines and Puerto Rico starting the tradition of American imperialism.
William McKinley won a second term but an Anarchist called Leon Czolgosz (who was considered deranged) shot him, McKinley died several days later in hospital. Theodore Roosevelt who was his Vice President took over as president.  
- John F. Kennedy who was also shot dead.
- Gabby Gifford who was also shot but survived with serious injuries.