This was where, in 1990, Hazel Buchanan, a Sunday school teacher, met Colin Howell, a dentist and a charismatic preacher. With James Nesbitt, Genevieve O'Reilly, Patrick O'Kane, Nina Woods. https://www.irishmirror.ie/secret-colin-howells-nine-children-8014417 Watch with Acorn TV Lesley Clarke and Trevor Buchanan were killed by their respective spouses Colin Howell and Hazel Buchanan who had been having an affair. Ghislaine Maxwell documentary coming to TV soon. The killer kept his heinous crimes secret for 18 years before justice was served. Killer dentist: Hazel Stewart – the farmer's daughter who church elders tried to keep away from Colin Howell. James Nesbitt plays They said: “Lauren was the only child to keep in contact with Colin. The Secret is the story of a real-life double murder. Kyle Jorgensen, 47, was told by … In this episode the 1991 case of Northern Irish convicted double murderer Colin Howell is covered. The two begin an adulterous affair that will lead them to enter into a deadly pact. Respectable dentist Colin Howell meets and falls in love with Hazel Buchanan at his local Baptist church. READ MORE. Double killer Colin Howell with his wife Lesley. 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. 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 / … Double killer Colin Howell (Image: Sunday Mirror). With Monica Chiles, Diane Ellis, Ross K. Foad, Katrin Larissa Kasper.