Of all the men elected to the American presidency, William H. Harrison had the shortest reign. Harrison was elected the ninth president in 1840, and inaugurated on March 4, 1841.
Although there was a driving rainstorm in Washington, D.C., that day, Harrison rode through the streets for the inaugural parade, and caught a cold.
The cold later developed into pneumonia, and Harrison died on April 4, one month after he took office. He was the first American president to die in office.
Since Harrison, every American president elected in a year ending in “0″ has died in office!