Pregnant 26-year-old Ohio woman, Jessie Marie Davis, was reported missing on 13th June 2007 by her mum who found her grandson home alone with bleach spilled on the ground and furniture broken and overturned. The whole town was out looking for Jessie but then... her police officer boyfriend owned up to the police. Cops Who Kill lifts the lid on eight cases of murder and betrayal by police officers in Britain and around the world. In each episode, TV personality and actor Will Mellor is joined by experts, including ex-Detective Superintendent Julie McKay, psychologist Serena Simmons, and ex-Murder Detective Howard Groves, to try to unravel how and why a police officer switches from law enforcer to lawbreaker, how they were finally brought to justice, and the horrendous consequences for all concerned.