Michael James Shaw (born September 16, 1986) is an American actor and writer. He is best known for his roles as Mercer in the TV series The Walking Dead and as FBI Agent Daryl/"Mike" in Limitless. Shaw also had a recurring role in Constantine as Papa Midnite, and a small role in Roots as Marcellus. Shaw portrayed Corvus Glaive in the Marvel Cinematic Universe films Avengers: Infinity War and Avengers: Endgame. (Via Wikipedia)