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Over the years, countless cold case investigators have looked into the murders of Melissa

Rojoric and Barbara McLean, who were found dead outside of Calgary in

1976 and 1977. Police have revisited each crime scene and reviewed every file down to the

most minute details. Every time, they hope to find something that would be a catalyst to push the

investigation forward. But every time, they came up empty-handed, and the killer remained on the

loose. Then, finally, in 2003, more than 26 years after they were killed, that changed. But it wasn't fresh evidence

that would lead to a break in the case. It was an advancement in science. In 2003, the DNA samples

that were recovered from Melissa and Barbara were tested and they were both confirmed

to be an exact genetic match to one unknown male offender. So what that tells us is, the

same person who had left their seminal fluid on Melissa was the same one with Barbara. We were looking for one person.

This was the moment police knew

they were looking for a serial killer.

It was a major development

that provided fresh hope

that justice would be served

...