Code of a Killer Catch up on the ITV Hub Full Series Series 1 available Ground-breaking crime drama based on a true story. John Simm and David Threlfall star as scientist and detective, both intent on solving a grisly Leicester murder case using pioneering DNA methods. 2 episodes available to watch Share this programme: Copied to clipboard Share on Facebook Share on Twitter Copy link to share Full Series Series 1 Episode 1 A scientist's breakthrough helps a detective track down a murderer. Latest Episode 2 DCS Baker proposes an extraordinary idea to catch the killer.