Steven Jones was a pillar of the community. A well respected "giant of a man", Jones had faithfully served on the force for years. But questions soon arise when his wife is killed suddenly in a car accident. Why was the driver's seat positioned for a much larger person than she, and why did her head injury match that made by a truncheon? 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.