Instagram/Michael E. Knight & Genie TV Michael E. Knight exits General Hospital as Martin Grey. Discover the tense storyline with Laura and the mysterious offer that pulls him from Port Charles. April 15, 2026 AceShowbiz - General Hospital fans are facing another unexpected departure as Michael E. Knight exits his role as Martin Grey. The storyline surrounding Martin's exit unfolds with tension and intrigue, centering around his sister Laura Collins, played by Genie Francis, and a mysterious figure who pulls Martin away from Port Charles.