"... eight presidents have died in office: four were assassinated and four died of natural causes"
[*] William Henry Harrison became ill with a cold after being caught in a torrential downpour without cover.
[*] July 4, 1850, Zachary Taylor he became severely ill with an unknown digestive ailment.
[*] Warren G. Harding; died from a sudden heart attack
[*] March 29, 1945, Franklin D. Roosevelt The president's attending cardiologist, Dr. Howard Bruenn, diagnosed a massive cerebral hemorrhage (stroke).
No president died in his sleep.