Williamson has made many guest appearances in TV and film. His most recent film appearances have included "Ali" (2001),"The Assassination of Richard Nixon" (2004), "Get Rich or Die Tryin'" (2005), "ATL" (2006), "Lucky Number Slevin" (2006), "August Rush" (2007), "Black Dynamite" (2009), "The Final Destination" (2009), and "" (2016). He was Juror #10 in the 1997 TV movie remake of "12 Angry Men" (picking up the Ed Begley role). He also appeared in a short-lived TV series remake "The Fugitive" (CBS, 2000–2001). CBS cancelled the series after one season with a total of 22 episodes.