Jack Walsh is a bounty hunter played by Robert de Niro in the movie, Midnight Run.
IIn the movie, Walsh is enlisted by bail bondsman Eddie Moscone to bring accountant Jonathan "The Duke" Mardukas back to L.A. The accountant had embezzled $15 million from Chicago mob boss Jimmy Serrano before skipping the $450,000 bail Moscone has posted for him. Jack must bring Mardukas back within five days, or Eddie defaults. Eddie says the job is easy, a "midnight run", but Jack demands $100,000. Jack is then approached by FBI Agent Alonzo Mosely, who wants Mardukas to be a witness against Serrano and orders Jack to keep away from Mardukas, but Jack takes no notice and instead steals Mosely's ID, which he uses to pass himself off as an FBI agent along his journey.