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It was a shocking announcement that made international headlines.

One man, a serial killer, was responsible for the murders of four young women in the late 70s.

Through a technique known as investigative genetic genealogy, investigators broke a decades-old cold case wide open, ultimately confirming through DNA that an American man named Gary Sreri was responsible for the murders of Eva Dvorak, Patsy McQueen, Melissa Rohorik, and Barbara McLean in Calgary.

After identifying him as a suspect, police spent months tracking down family, friends, and former associates of SREI to build a detailed timeline of his movements and try to figure out if he was responsible for other unsolved homicides.

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