DNA on a Cigarette Cracks a 35-Year-Old Cold Case!

In 1984, 58-year-old Mary McLaughlin was found strangled in her Glasgow flat. For decades, the case remained unsolved—until forensic scientists made a shocking discovery. A single cigarette butt, preserved for 35 years, held the DNA of her killer. Advanced testing led detectives to Graham McGill, a convicted sex offender who had been on parole at the time of the murder. But how did he evade justice for so long? And what finally led to his conviction in 2021? Watch the full story of how modern science cracked a decades-old cold case!

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Видео DNA on a Cigarette Cracks a 35-Year-Old Cold Case! канала Black Files