The son of killer dentist Colin Howell tells his story
This episode was first published in February 2026.
On the night of his second birthday in May 1991, Seamus Daniel Howell’s mother Lesley was murdered by his father, Colin Howell, and his father’s lover, Hazel Stewart.
The pair also killed Stewart’s husband Trevor Buchanan.
They left the two bodies in a garage in Castlerock, Co Derry, staging the scene to make it look as if they had taken their own lives.
The pair had committed the perfect murder so they could be together. And they had got away with it.
That is until 2009 when Colin Howell, a respected dentist and devout evangelical Christian…
The skinny
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