Good Morning Britain host Piers Morgan re-enters the macabre world of American crime, and the interviewee in this week’s film could be his most disturbing subject yet.

Between 1977 and 1993, Lorenzo Gilyard went on a killing spree that claimed the lives of a dozen women, who he raped and strangled, before he disappeared without a trace.

Missouri State Police feared they would never catch him, but advances in DNA profiling meant they finally caught the Kansas City Strangler in 2004. By that time Gilyard had a good job and was happily married, while hiding his terrible secret.