More than 4 MILLION viewers tuned in to watch the true story of self-confessed Coleraine killer Colin Howell when it first aired.
The Secret was screened by ITV across the UK, and in Northern Ireland 356,000 people were glued to the first part of the disturbing series staring James Nesbitt.
The series reveals how dentist Howell and his lover, Hazel Stewart had an affair and then murdered their spouses, nurse Lesley Howell and police constable Trevor Buchanan on May 19, 1991, covering up their crime with a claim the victims has entered into a joint suicide pact.
