William Henry Harrison , at 68, was the oldest when he died in office.
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Their choice of vice-president would take office as the new president if the president-elect should die.
The 9th President of the United States William Henry Harrison was the first to die in office in 1841 only 32 days into his term.
Yes ,William Henry Harrison was the first president to die while in office. He died in the White House after catching a cold.
Millard Fillmore
The assistant president will be sworn into office.