“Painkiller,” Vigilante Thriller By Filmmaker Mark Savage (“Purgatory Road” and “Stressed to Kill”) Hits On Demand, Digital and DVD May 4th, 2021 Monday, May 3, 2021 Painkiller, a captivating new thriller by filmmaker Mark Savage (Purgatory Road, Stressed to Kill), starring Bill Oberst, Jr. and Michael Pare'…