On July 1, 1867, Meagher fell from the deck of the steamboat G.A. Thompson while docked in Fort Benton and disappeared. It is unclear what happened, and we may never know the truth. Some suspect foul-play. Meagher had many enemies, including the members of the Vigilante Committee. One of the members, Wilbur Fisk, was with him on his last day. More @Wikipedia
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