Should I Marry a Murderer? sounds like a tabloid dare. However, Netflix’s three-part docuseries turns that question into something much harder: what happens when love, fear, guilt, and public duty collide?
The series follows Dr. Caroline Muirhead, a forensic pathologist from Glasgow, Scotland, who met outdoorsman Alexander “Sandy” McKellar on Tinder in early October 2020. Their romance moved fast. By November 28, 2020, Sandy had proposed. Soon afterward, he told her that he had killed charity cyclist Tony Parsons three years earlier and buried his body on the Auch Estate.
Netflix released the docuseries on April 29, 2026, and the Should I Marry a Murderer Netflix story quickly became more than another true-crime binge. It is also a case study in coercion, trauma, and the uneasy limits of asking a civilian to help break a cold case.
Should I Marry a Murderer: The Core People in the Case
- Dr. Caroline Muirhead: A Glasgow forensic pathologist who worked in a local mortuary and later helped police find Tony Parsons’ remains.
- Alexander “Sandy” McKellar: A hunter and gamekeeper on the Auch Estate near Bridge of Orchy in the Scottish Highlands.
- Robert McKellar: Sandy’s twin brother, who was in the vehicle when Parsons was struck.
- Tony Parsons: Also identified as Anthony Parsons, a 63-year-old charity cyclist on a 100-mile solo ride.
- Margaret Parsons, Mike Parsons, and Victoria Parsons: Tony Parsons’ widow and children, photographed leaving the High Court in Glasgow after sentencing on August 25, 2023.
- Stephen and Margaret Muirhead: Caroline’s parents, who appear among the documentary’s interviewees.
- David Green: Former head of homicide and major crime for Scotland’s Crown Office and Procurator Fiscal Service.
- Charles Blackbourne: A bartender described by Netflix as the last person to see Tony Parsons alive.
- James O’Kelly: Caroline’s friend and one of the documentary interviewees.
- Lorna Dawson: A forensic soil scientist interviewed in the series.
- Greg Bryce: A former police officer interviewed in the series.
- Josh Allott: Director of Should I Marry a Murderer? and The Man with 1000 Kids.
How Caroline Muirhead Met Sandy McKellar
Caroline had come through what she and her friends described as a devastating breakup from an allegedly abusive man. Then she joined Tinder. Sandy’s profile sold a rugged fantasy: “6ft 4 Highlander: Lonely contractor looking for someone to keep him warm on cold nights on the farm.”
There was an unusual connection. Caroline dealt with death professionally in pathology. Sandy dealt with death as a hunter. That gave them a shared language most first dates never touch.
Yet warnings appeared early. Robert McKellar allegedly told Caroline that Sandy was “not right in the head.” Caroline also later described Sandy as charming while sober but loud and aggressive when drunk.
The Confession That Changed Everything
Late on September 29, 2017, Sandy drove drunk on the A82 near Bridge of Orchy, Argyll and Bute. Robert was in the passenger seat. They struck Tony Parsons while he was riding his bicycle.
Parsons did not simply vanish, although that is what his family endured for years. The brothers did not call for medical help. Instead, they moved Parsons and his bike, returned to the Auch Estate, changed clothes, switched vehicles, came back, and eventually buried his body on the estate.
When Sandy confessed to Caroline after their engagement, she froze. “My brain wasn’t in a position to go to the police,” Caroline says in the series. “My brain still wasn’t accepting what I’d been told.”
That reaction is one reason the documentary works. It refuses the easy version of bravery. Caroline did not become a clean heroic archetype overnight. She was terrified, attached, overwhelmed, and still processing the fact that her fiancé had placed a dead man between them.
How Caroline Helped Police Find Tony Parsons
Caroline called the police on December 27, 2020. Three days later, Sandy and Robert were arrested. However, investigators could not find Parsons’ body, and the brothers were released without charges.
Caroline then continued seeing Sandy while secretly gathering evidence. She recorded conversations with the brothers, including Robert’s admission that Parsons was still alive when they left the scene.
On a later visit to the estate, Caroline told Sandy she would need the exact burial location if she was going to help move the remains. Once he showed her, she discreetly left a crushed Red Bull can to mark the spot.
In January 2021, police followed that clue and found Parsons’ remains. Nine days later, Caroline helped police locate the brothers. Sandy and Robert were arrested again and remanded in custody.
The Charges, Sentences, and Civil Case
The case initially moved toward murder charges after autopsy evidence. Forensic experts said Parsons may have survived up to half an hour after the collision. His injuries included severe blunt force trauma to his pelvis, ribs, and spine, and possibly a collapsed lung.
Eventually, prosecutors accepted a plea deal. Sandy pleaded guilty to culpable homicide. Both Sandy and Robert pleaded guilty to attempting to pervert the course of justice.
At the High Court in Glasgow, Sandy was sentenced to 12 years in prison. Robert received five years and three months. In January 2025, Sandy settled a civil case out of court when his insurance company issued a six-figure payment to Parsons’ family.
Sandy’s lawyer said his client “accepts that, while catastrophically injured, Mr Parsons was alive at the time.” He added that Sandy said he was “too much of a coward to come clean.”
Where Caroline Muirhead and Sandy McKellar Are Now
Caroline now lives on the Scottish coast. She is sober, sees a psychiatrist regularly, and has rebuilt her relationship with her family. She has also found a new partner, although she has not publicly shared his name.
In the final moments of the documentary, Caroline says, “I met someone new, who is incredibly kind.” She adds, “When you love yourself, you will attract healthy love. Onwards and upwards.”
Sandy remains in prison in Scotland, serving his 12-year sentence. Robert was sentenced to five years and three months. Coverage differs on whether Robert is still serving that sentence, so BuddyTV is treating his exact custody status as not fully confirmed without a current official prison record.
Caroline has also criticized Police Scotland. She said she felt threatened with possible trouble if she did not cooperate, even while carrying the danger and emotional burden of the investigation.
Police Scotland’s public statement focused on the Parsons family, the “brutal and uncaring actions” of the men, the major search operation, and the January 2021 discovery of remains near the A82. It did not name Caroline in the quoted statement.
Why the Should I Marry a Murderer Story Still Hits Hard
The most chilling part of Should I Marry a Murderer? is not only Sandy’s confession. It is the emotional trap Caroline had to escape while still helping prove what happened to Tony Parsons.
Josh Allott says the series “explores the moral dilemma at the heart of this story.” He frames the question clearly: “Do you choose to keep that secret and live with the awful consequences or reveal it and destroy the person you love and everything you’ve hoped for?”
Caroline’s answer came at enormous personal cost. Yet she has no regrets about exposing Sandy. “He wasn’t convicted of murder,” she says in the Netflix series, “but he did take an innocent man’s life.”
That is why the Should I Marry a Murderer case lingers after the credits. The title asks a sensational question. Caroline Muirhead’s life after Sandy McKellar gives the answer its human weight.
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