Question: What was the cause of William McKinley's death?
About the article "Assassination of William McKinley", section "Abstract".

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Beck painted what would become President William McKinley's last portrait.
During McKinley's visit to Buffalo, Beck arranged to observe McKinley during his tour of the Exposition, including the President's speech to a crowd of 50,000 near the Triumphal Bridge.
With the preliminary sketches for the portrait completed, Beck left Buffalo for a business trip to New York City.
Beck was in New York when McKinley died and he went to work immediately to complete the portrait entitled "President McKinley Delivering His Last Great Speech at the Pan-American Exposition, Sept. 5, 1901."
The portrait was hung in the U.S. Senate and later became property of the Buffalo History Museum. 
 William McKinley's re-election as Governor of Ohio in 1893 is mentioned.  
 Hurricane Agnes, 1972 the Angola Horror train wreck, 1867 [http://www.catskillarchive.com/rrextra/wkbkch02.
Html] Attica Prison riot, 1971 The first execution via the electric chair, in Auburn Prison in 1890 the Binghamton shootings the Cherry Valley massacre, 1778 the collapse of the New York State Thruway Bridge over Schoharie Creek, 1987 [http://www.eng.uab.edu/cee/faculty/ndelatte/case_studies_project/Schoharie.htm] Continental Airlines Flight 3407 Hurricane Irene, 2011 The Jerry Rescue The 1901 assassination of President William McKinley in Buffalo, prompting his Vice-President Teddy Roosevelt to travel to Buffalo twice: first, after learning of McKinley's shooting, from Isle La Motte, Vermont in Lake Champlain; then, having left Buffalo as McKinley was appearing to recover, from an Adirondack hunting trip upon learning of McKinley's death, to be sworn in as McKinley's successor.
Anarchist Leon Czolgosz, McKinley's assassin, was subsequently electrocuted in Auburn Prison.
The Morgan Affair The Northeast Blackout of 1965 The Northeast Blackout of 2003 The Battle of Oriskany, 1777 the Remington Rand strike of 1936–1937 The Battle of Saratoga, turning point of the American Revolutionary War.
The 1848 Seneca Falls Convention, the first women's rights convention held in the United States the Split Rock Explosion, 1918 the Sullivan Campaign, 1779  
Francis Delafield was the primary physician who was consulted following the shooting of United States President William McKinley in September 1901.
While Francis argued to use the X-Ray machine to photograph McKinley's organs and assess the damage, he met opposition from others unwilling to use the new technology.
Some attribute this inaction to contributing to McKinley's ultimate demise. 
John Raymond Hazel (December 18, 1860–October 31, 1951) was a United States jurist and politician, best known for administrating the swearing in ceremony of then Vice President Theodore Roosevelt as the 26th President of the United States.
He was a resident of Buffalo, New York.
Following the shooting of President William McKinley by Leon Czolgosz, Roosevelt had gone climbing in the Adirondack mountains, as at that time the president's medical condition was not viewed as life-threatening.
When McKinley's condition worsened, a runner was sent to notify Roosevelt, who then returned to Buffalo.
After McKinley's death, Roosevelt was inaugurated as president at the Ansley Wilcox House (now Theodore Roosevelt Inaugural National Historic Site) by Hazel, then U.S. District Judge (Western District of New York).
Unlike other presidents, Roosevelt did not use the Bible.
Hazel, who served as a federal judge from 1900 to 1931, was also a delegate to the 1900 Republican National Convention (which nominated Roosevelt as its vice-presidential candidate.)