The new Netflix true-crime docuseries Should I Marry a Murderer? tells a shocking story from Scotland. A woman named Caroline Muirhead thought she found her perfect partner on Tinder. But days after getting engaged, her dream man admitted he killed someone. The three-part series, which started streaming April 29, 2026, follows Caroline’s painful journey from being in love to becoming the key person who helped send her fiancé to prison.
Caroline worked as a forensic pathologist in Glasgow. She met Alexander “Sandy” McKellar, a rugged hunter from the Scottish Highlands, on the dating app. Their first date in October 2020 felt like a movie. She fell for him fast. Within weeks, they were engaged. But when Caroline asked Sandy to share everything he was not proud of, her world collapsed.
A Nightmare Discovery After the Engagement
Sandy told Caroline that three years before they met, he hit a cyclist with his truck. The victim was Tony Parsons, a 63-year-old grandfather and cancer survivor. He was riding 100 miles to raise money for prostate cancer charity. Sandy admitted that he and his twin brother Robert buried the body on the 28,000-acre farm where they lived.
The confession left Caroline trapped. She said: “To remain in love, you have to keep this secret that you know is gonna destroy you. But if you reveal it, then you destroy everything. I mean, what would you do?” The documentary shows her struggle. She loved Sandy. But she also knew a family somewhere was still searching for their missing father.
Caroline Takes a Huge Risk to Catch a Killer
Caroline made a brave decision. She asked Sandy to show her exactly where he buried Tony Parsons body. During a visit to the farm, she secretly marked the spot with a Sugar Free Red Bull can. At the time, Sandy was carrying a gun for hunting. She then went to the police.
But the police did not arrest the brothers right away. They said there was not enough proof. Caroline felt abandoned. The system she trusted left her alone. She said: “When I came forward in December 2020, I trusted that the system would keep me safe… but that wasn’t my experience”.
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A Toxic Love Story and The Path to Prison
Feeling hopeless and unable to work, Caroline went back to Sandy. Director Josh Allott, who also made The Man with 1000 Kids, describes this part as a “toxic love story”. Caroline turned to alcohol and cocaine to cope. She kept seeing her killer fiancé. But she also secretly recorded his drunken confessions.
“Making the documentary meant revisiting the darkest of times, and none of that was easy. But it has also been a cathartic experience. For the first time in several years, I now have hope for the future.”
— Caroline Muirhead
Finally, the police arrested the McKellar brothers. In 2023, Sandy McKellar admitted to culpable homicide. A judge sent him to prison for 12 years. Robert McKellar got five years and three months for trying to hide the crime. After the trial, Caroline had to rebuild her life from nothing.
Where is Caroline Muirhead Today?
So, where is Caroline Muirhead now in 2026? She does not live in fear anymore. She moved away from Glasgow to a quiet home by the Scottish seaside. She has worked hard to become sober after struggling with addiction during the case.
Caroline is also focusing on her mental health. She attends regular therapy to deal with the trauma. In a surprising turn, she has found love again. She is now in a new committed relationship with a kind partner who supports her. While her experience with the police was painful, she has returned to her career as a forensic pathologist. She is speaking out to change the law so that witnesses like her get better protection from the system.
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