lithograph depicting the explosion Kennon died aboard ship near
Fort Washington, Maryland on February 28, 1844. On that date,
USS Princeton departed
Alexandria,
Virginia on a demonstration cruise down the
Potomac River. In attendance were
President John Tyler, members of his
Cabinet, former
First Lady Dolley Madison,
Senator Thomas Hart Benton of
Missouri, and approximately four hundred guests. As part of the demonstration, Captain
Robert F. Stockton decided to fire the larger of the ship's two new long guns,
Peacemaker. The gun was fired three times on the trip downriver and was loaded to fire a salute to
George Washington as the ship passed
Mount Vernon on the return trip. The guests aboard ship observed the first set of firings and then retired below decks for lunch and refreshments. Afterwards,
Thomas Walker Gilmer, the
Secretary of the Navy and a lifelong friend of Kennon's, urged the guests to view the final shot of the
Peacemaker. When Captain Stockton pulled the firing lanyard, the gun burst. Its left side had failed, spraying hot metal across the deck and shrapnel into the crowd. Instantly killed were: Kennon; Gilmer; the
Secretary of State,
Abel P. Upshur;
Maryland attorney and politician
Virgil Maxcy;
David Gardiner, a New York lawyer and politician; and the President's valet, a black slave named Armistead. Another sixteen to twenty people were injured, including several members of the ship's crew, Senator Benton, and Captain Stockton. The President was below decks and not injured. The dead were accorded a state funeral in the
East Room of the
White House. Kennon was first buried at
Congressional Cemetery in
Washington, D.C., and later re–interred In Lot 544 of
Oak Hill Cemetery in Washington. ==Family==