Dermot Mulroney Joins the Cast of Scream 6! byNick Meece •June 03, 2022 0 Veteran actor Dermot Mulroney (TV's Shameless) has joined the ever-growing cast of Scream 6! Details are vague but he'll most likely be playing a cop...a possible Dewey substitute. News via The Hollywood Reporter. Tags: Dermot Mulroney News & Updates Scream VI