It took the jury two-and-a-half hours to reach their decision of guilty.
After the jury foreman delivered the verdict Lisa, Stewart’s daughter wept uncontrollably, and said “It’s not fair.” The bodies of Lesley Howell and Trevor Buchanan were discovered in a fume-filled car outside a house in Castlerock in May 1991.
She organised clothes to dress the body then watched as Howell carried her husband to the car, placing him beside Lesley.
Vulnerable She took the pipe used to gas their spouses and burned it, cleaned up the bedroom and opened the windows.
Hazel’s husband Trevor said he was “absolutely gutted” but both wanted their marriages to work.
And for four months, the couples received counselling and stuck to strict guidelines laid out by the church. And on the morning of 19 May, 1991, the bodies of Trevor Buchanan and Lesley Howell were found in a fume-filled car at the back of a row of cottages in Castlerock.
Her ex-lover, former dentist Colin Howell, is serving 21 years after he pleaded guilty to the killings.
The jury at Coleraine Crown Court found Stewart guilty after a 15-day trial. Stewart will return to court next Friday when she will learn the minimum jail term she must serve.
He was sentenced in November 2010 then gave evidence for the prosecution during Hazel Stewart’s trial.
During the trial the court heard that Stewart played a part in the planning of the killings.
She also disposed of evidence including the hose pipe used to gas their spouses.
Stewart claimed she was “soft, weak vulnerable, and easy prey” painting her former lover as “obsessed, calculating, controlling and very manipulative”.
In court appearances, where she has wept in the dock or sat frozen faced, her second husband, retired police superintendent David Stewart has been there.