They said: “Lauren was the only child to keep in contact with Colin. With Monica Chiles, Diane Ellis, Ross K. Foad, Katrin Larissa Kasper. Double killer Colin Howell with his wife Lesley. This was where, in 1990, Hazel Buchanan, a Sunday school teacher, met Colin Howell, a dentist and a charismatic preacher. James Nesbitt plays The estranged American wife of double murderer Colin Howell who told police she kept his crimes secret for over a decade will not face prosecution. Watch with Acorn TV https://www.irishmirror.ie/secret-colin-howells-nine-children-8014417 The two begin an adulterous affair that will lead them to enter into a deadly pact. Double killer Colin Howell (Image: Sunday Mirror). Respectable dentist Colin Howell meets and falls in love with Hazel Buchanan at his local Baptist church. With James Nesbitt, Genevieve O'Reilly, Patrick O'Kane, Nina Woods. The Secret is the story of a real-life double murder. In this episode the 1991 case of Northern Irish convicted double murderer Colin Howell is covered. From left, Hazel Buchanan (Genevieve O’Reilly), Colin Howell (James Nesbitt), Lesley Howell (Laura Pyper) and Pastor John Hansford (Jason Watkins) Photograph: Steffan Hill/Hat Trick / … Kyle Jorgensen, 47, was told by … Lesley Clarke and Trevor Buchanan were killed by their respective spouses Colin Howell and Hazel Buchanan who had been having an affair. The killer kept his heinous crimes secret for 18 years before justice was served. READ MORE. Ghislaine Maxwell documentary coming to TV soon. Killer dentist: Hazel Stewart – the farmer's daughter who church elders tried to keep away from Colin Howell.