William H. Bissell becomes the first Illinois governor to die in office
Governor William Henry Bissell, the Republican governor of Illinois, died of pneumonia in the afternoon of this day. A decorated Mexican War officer and several term congressman, he was forty-seven years old. Two days later, John Wood, the sitting lieutenant-governor, was sworn in as governor. (By John Osborne)
David L. Lightner, "Bissell, William Henry," American National Biography Online, February 2000, http://www.anb.org/articles/04/04-00107.html.