Silas Weir Mitchell (born Silas Weir Mitchell Neilson; September 30, 1969) is an American character actor. He is known for starring as Charles "Haywire" Patoshik in the Fox television series Prison Break (2005–2007), for the recurring role of Donny Jones in My Name Is Earl (2005–2009), and as Monroe in the NBC television series Grimm (2011–2017).