The similarity between his name and that of John Lennon's assassin (Mark David Chapman) prevented him in 1985 from playing Lennon in John and Yoko: A Love Story, a biographical film produced by NBC. The role went instead to Mark McGann. Chapman's real name surfaced when the story was published in Britain, and reporters began making inquiries about the actor, who was then working as a bricklayer with his father. He had changed his name when he joined Equity, because there was already a Mark Chapman in the union. However, he portrayed Lennon in Chapter 27, a film about Mark David Chapman, released in 2007 at the Sundance Film Festival.