Presidents 1840 - 1960
Every President of the United States elected in the years 1840, 1860, 1880, 1900, 1920, 1940 and 1960 died in office.
William Henry Harrison, died of pneumonia on April 4, 1841
Abraham Lincoln, was assassinated on April 14, 1865 - he died the next day
James Garfield, was shot by an assassin on July 2, 1881 and died of complications from his injuries on September 19, 1881
William McKinley, was also shot by an assassin on September 6, 1901 and died eight days later
Warren G. Harding, died of a heart attack on August 2, 1923
Franklin D. Roosevelt, died of a cerebral hemorrhage on April 12, 1945
John F. Kennedy, was assassinated on November 22, 1963
Zachary Taylor, died of a gastrointestinal illness on July 9, 1850, and was elected in 1848 is the only President to die in office not elected in those years.
Ronald Reagan, who was elected in 1980, broke the pattern.