Per his Wikipedia entry:
William McWaters (ca. 1844–1875) was an American gunfighter from Missouri who once rode with William Clarke Quantrill. McWaters joined a group of guerilla fighters, commonly called bushwhackers. In 1867 McWaters became a suspect in the murder of General Joseph Bailey, sheriff of Bates County. William McWaters was shot and killed by a prison guard, on May 26, 1875.
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Note: “…he returned to his father's farm only to find that his father and a brother had been killed in the partisan backlash over the railroad derailment, their farm laid to ruin and the rest of his family driven from the county…”