Trivia Besides playing Al Capone, William also played another real life mobster, Sammy "the Bull" Gravano, in the 1996 TV movie Gotti.
William has an extensive and noted career in theatre, on and off Broadway.
William is best known equally for playing bad guys as well as hard-nosed cops on television and in film.
William appeared as himself in the documentary The Revenge of the Dead Indians (1993)
William appeared in the documentary Dick Tracy: Behind the Badge, Behind the Scenes (1990).
William made his major motion picture debut in the film Long Shot (1980).
William was the Executive Producer for the film Paradise Lost (1999).
William was the Co-Producer of the film Big City Blues (1999).
William was the Executive Producer for the film Beyond Desire (1996).
William was the Producer for the film The Last Letter (2004)
William Forsythe Quotes
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So this week's episode of 'Grimm' is one of the show's occasional jaunts..