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In May 1991, in the Northern Irish town of Coleraine, 31-year-old Lesley Howell and 32-year-old police officer Trevor Buchanan were found dead inside a parked car in a garage in Castle Rock, killed by carbon monoxide poisoning. Both had been trapped in a web of extramarital affairs within their tight-knit Baptist church community. For nearly two decades, their deaths were officially ruled a double suicide stemming from the shame of their infidelity. However, the truth was far more sinister. Colin Howell, Lesley's dentist husband and Trevor's secret co-conspirator with Trevor's wife Hazel, had meticulously planned and executed the murders to remove their spouses and be together. For eighteen years, Colin and Hazel lived free, maintaining the facade of grieving, God-fearing community members while secretly maneuvering through subsequent relationships, financial ruin, and new tragedies. The case finally cracked in 2009 when a severely distressed Colin walked into his church and confessed to the murders, leading to convictions that exposed a deeply flawed initial police investigation and unraveled a chilling portrait of manipulation, religious hypocrisy, and cold-blooded premeditation.
The episode opens with the host’s intro and a series of sponsor messages.
Jim Flanagan investigates Leslie Howell’s disappearance and finds a car at her father’s house.
Colin Howell suspects Leslie’s disappearance involves her lover, police officer Trevor Buchanan.
Multiple searches of the house uncover no evidence until the car’s interior reveals the bodies.
Leslie and Trevor are found dead in a Renault with a hose, indicating suicide by CO poisoning.
Autopsies confirm no foul play; the deaths are ruled a suicide pact driven by emotional distress.
Lesley’s early life, marriage, career struggles, and mental health issues are detailed.
Colin’s career flourishes, then financial ruin and moral crisis lead to a decline in his wellbeing.
The families cope with the tragedy, with differing narratives and attempts at reconciliation.
Colin’s extramarital affair with Hazel Buchanan is revealed, causing further marital turmoil.
Colin confesses to killing Lesley and Trevor, but later withdraws and continues his life.
The episode ends with lingering questions about the true motives and the impact on the community.
The episode opens with a promotional segment for the second‑hand marketplace app Vinted.
Church elder Jim Flanagan opens a garage door in Castle Rock, discovering a garden hose connected to a car exhaust pipe, with Trevor Buchanan dead in the driver's seat and Lesley Howell in the back.
Pathology tests reveal three different prescription sedatives in Lesley's system, though all are within therapeutic ranges and did not contribute to her death.
Suspicious inheritance motivesinsight
Detective David Green notes that Lesley's father died unexpectedly just 11 days before Lesley, leaving her a £200,000 inheritance that ultimately passed to Colin Howell.
After years of financial ruin and personal crisis, Colin Howell walks into his church in 2009 and confesses to the elders that he murdered Lesley and Trevor.
Executing the murderstory
Colin Howell sneaks a garden hose into his living room while Lesley sleeps under a blanket, later straddling her when she wakes up and calls out for her son.
Hazel Buchanan's convictiondata
A jury takes just two and a half hours to find Hazel Buchanan guilty of murdering Lesley Howell and Trevor Buchanan, receiving a life sentence with an 18-year minimum.
“The Renault's engine was no longer running, but Jim noticed a garden hose attached to the exhaust pipe led into the car.”
“Autopsies confirmed that the pair had died from carbon monoxide poisoning.”
“Lesley and Trevor appeared otherwise, normal and healthy, with no signs of violence or other suspicious injuries.”
“The findings were consistent with the scene at Castle Rock.”
“He convinced himself that it was a merciful thing to do, not unlike euthanasia.”
“He then jammed their bedroom door shut with a hockey stick.”
“I was overwhelmed by my conscience with hiding this crime for such a long time.”
“The court heard Howell had then gone on to deceive those around him by presenting himself as a decent, upstanding, hard‑working, religious and valuable member of society.”
In May 1991, Lesley Howell and Trevor Buchanan were found dead in a garage in Northern Ireland, apparently the victims of a tragic suicide pact. For almost two decades, that was the accepted truth. Then, in 2009, an unexpected series of events led to the exposure of a murder plot that had remained hidden in plain sight for eighteen years. --- Narration – Anonymous Host https://www.instagram.com/caseys.snaps/ Research & writing – Milly Raso Production & music – Mike Migas http://mikemigas.com/ Audio editing – Anthony Telfer Sign up for Casefile Premium: Apple Premium https://podcasts.apple.com/us/podcast/casefile-true-crime/id998568017?ign-itscg=30200S&ign-itsct=casefile_podcastsSpotify Premium https://spotifyanchor-web.app.link/e/9gSwcv7USsbPatreon https://www.patreon.com/casefileFor all credits and sources, please visit https://casefilepodcast.com/case-356-lesley-howell-trevor-buchanan Hosted on Acast. See acast.com/privacy https://acast.com/privacy for more information.
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