A British double killer should be investigated over a series of grisly unsolved murders in Belgium by "The Butcher of Mons", a cold case expert has said. The dismembered remains of five headless women were found in and around the city in the mid-90s when carpenter John Sweeney was on the run in Europe. By that time Sweeney, 66, played by Shaun Evans in the gripping new ITV drama Until I Kill You , had already murdered and dismembered one woman in neighbouring Holland. Kurt Wertelaers, the