William "Bill" Williamson is the tertiary antagonist in Red Dead Redemption. He is a former gang partner of John Marston. Marston has been extorted into hunting down his former brothers in arms, with Bill Williamson being the primary target. The hunt for Bill Williamson serves as the impetus for the game's plot, and is the central motivating factor throughout. Bill is the main antagonist of the New Austin and the Nuevo Paraiso chapter. He is voiced by Steve J. Palmer.