When Alexander "Sandy" McKellar confessed to his fiancée in November 2020 that he and his twin brother had killed a cyclist and buried the body in the Scottish Highlands, Caroline Muirhead made a decision that few people in that position would have had the composure to make: she stayed. Not out of complicity, but out of resolve. The resulting three-part Netflix docuseries, Should I Marry a Murderer, released on April 29, 2026, offers the first full account of Muirhead's perspective - and it has earned a perfect critical score on Rotten Tomatoes for good reason.
The Confession That Changed Everything
Tony Parsons was a cyclist killed in a hit-and-run on a dark Highland road in 2017. For three years, his family had no answers. Then Sandy McKellar, in an act he apparently framed as intimacy and trust, told his fiancée what he and his brother Robert had done - including that they had buried Parsons' body on the Auch Estate. By Muirhead's own account, she initially felt, disconcertingly, a sense of being trusted with something profound. That feeling quickly gave way to something harder and more purposeful.
Muirhead began gathering evidence. She remained in the relationship long enough to become a credible, informed witness, and when Sandy and Robert McKellar were arrested on December 30, 2020, her cooperation with investigators proved critical. After Parsons' remains were discovered, Sandy was remanded in custody on January 12, 2021. In August 2023, he was sentenced to five years and three months in prison after pleading guilty to attempting to defeat the ends of justice. Prosecutor Ruth McQuaid described the brothers' actions as "heinous and calculating crimes which brought untold distress to Mr. Parsons' wife, children, and grandchildren."
A Narrative That Goes Beyond True Crime
What distinguishes Should I Marry a Murderer from the crowded true-crime field is its psychological honesty. The series does not position Muirhead as a simple hero or a naive victim. She has spoken openly about the vulnerabilities that drew her into the relationship in the first place, the insecurities that a controlling or compelling partner can exploit, and the therapeutic work required afterward to rebuild. "I've managed to get myself clean," she has said. "I now see a psychiatrist. And I tackle a lot of the insecurities that led me to be in that vulnerable relationship to begin with."
That candor is rare in a genre that often flattens human complexity into clean moral arcs. The docuseries builds on earlier coverage of the case - specifically a two-part arc within BBC Scotland's Murder Case series titled "The Vanishing Cyclist" - but this is the first production to place Muirhead's interior experience at the center. The result is a portrait of a woman who acted with remarkable clarity under extraordinary psychological pressure, and who has since rebuilt her life on the Scottish coast. She is now in a new relationship, describing her partner as "incredibly kind," and has offered a reflection that is both simple and earned: "When you love yourself, you will attract healthy love."
Where and How to Watch the Series
Should I Marry a Murderer is a Netflix original and streams exclusively on that platform. It is not available on Prime Video, HBO Max, Hulu, Apple TV, Google TV, or any other service. All three episodes are accessible with a standard Netflix subscription, subject to regional availability.
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