In 1977, a man was discovered inside an abandoned septic tank in rural Alberta, Canada. For decades, investigators did not know who he was, and the case became one of the country's most enduring mysteries.

Years later, advances in forensic science finally helped provide answers, giving a name back to a man who had been unidentified for more than forty years.

In this video, we examine the investigation, the efforts to identify the victim, and the developments that ultimately brought the case closer to resolution.

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In November 2000, investigators in Massachusetts discovered the remains of an unidentified young woman. Although the person responsible for her death was identified relatively quickly, the victim herself remained unknown for more than two decades.

Known only as "Chelsea Jane Doe," her case became an unusual mystery in which investigators knew the killer's identity long before they knew the victim's name.

This is the story of Tiffany Bradley, the long journey to restore her identity, and the forensic breakthrough that finally brought answers to her family.

Viewer discretion is advised.