The lover-turned-sleuth – and how she used a Red Bull can to help convict her killer fiance

When pathologist Caroline Muirhead said yes to her boyfriend’s proposal after just a few months of dating, she couldn’t believe her luck. Her elation soon turned to horror when the man in question, Alexander “Sandy” McKellar, shared a secret he’d kept for years – that he had killed a cyclist and buried him with the help of his twin brother.