TMDb/Memory of a Killer TV Patrick Dempsey returns to TV as a hitman with Alzheimer's in Fox's Memory of a Killer, a dark thriller far from his McDreamy days. April 18, 2026 AceShowbiz - Patrick Dempsey has taken on a dramatically different role in the Fox series Memory of a Killer, marking his return to network television more than ten years after his iconic portrayal of Dr. Derek "McDreamy" Shepherd on ABC's Grey's Anatomy.