Of the eight US Presidents who died in office, four were assassinated and four died of other causes:
Nine presidents had their terms finished by the vice-president, Eight of these died in office-( four from assassination and four from natural cause ) and one resigned before his term was over.
There was a pattern that the presidents electives in years divisible by 20 would die in office.. The presidents elected in 1840, 1860, 1880, 1900, 1920, 1940, and 1960 all died in office. Reagan was elected in 1980 but did not die in office ( although he was severely wounded in an assassination attempt)
William Henry Harrison (illness), Zachary Taylor (illness), Abraham Lincoln (assassination), James A. Garfield (assassination), William McKinley (assassination), Warren G. Harding (illness), Franklin D. Roosevelt (stroke), John F. Kennedy (assassination).
Eight presidents have died in office. Obama is our 44th president. 8/44 = 18 percent.
Lincoln, Garfield, McKinley and Kennedy.
Eight
Abraham Lincoln
Eight in total; four assassinated and four of illness or natural causes. William Henry Harrison: pneumonia Zachary Taylor: gastroenteritis Abraham Lincoln: assassination James A. Garfield: assassination William McKinley: assassination Warren G. Harding: heart failure Franklin D. Roosevelt: stroke John F. Kennedy: assassination
Some presidents are elected to two four year terms and leave office at the end of their term in office. Some presidents are elected to one four year term and leave at the end. The other presidents died in office, except Richard Nixon who was forced to resign.
The presidents either died or resigned, and their vice presidents took office, or the vice presidents were elected on their own.
Both of James Madison's Vice Presidents, George Clinton and Elbridge Gerry, died in office.
As of 2014, there have been four US Presidents that have died in office of natural causes. The presidents include William Henry Harrison, Zachary Taylor, Warren G. Harding, and Franklin D. Roosevelt.