The record was 18,967 days on Oct. 28, which stretched back to President John F. Kennedy’s assassination on Nov. 22, 1963. The previous mark was 18,966 days from George Washington’s inauguration on April 30, 1789 to William Henry Harrison’s death by pneumonia on April 4, 1841. Eight presidents died in office during a span of 122 years, which included three by assassination—Abraham Lincoln, James Garfield and William McKinley— during one 36-year stretch.
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