William Henry Harrison (February 9, 1773 – April 4, 1841) was an American military officer and politician who served as the ninth president of the United States in 1841. He died of typhoid, pneumonia or paratyphoid fever 31 days into his term, becoming the first president to die in office. His death sparked a brief constitutional crisis regarding succession to the presidency. Vice President John Tyler claimed a constitutional mandate to become the new president and took the presidential oath of office, setting an important precedent for an orderly transfer of the presidency and its full powers when the previous president fails to complete the elected term.Engraving credit: Bureau of Engraving and Printing; restored by Andrew Shiva