In the late 1970’s, there was a series of mysterious deaths. First, two jr. high girls were found in an underpass west of Calgary. Seven months later, another young woman was found in a ditch, beaten and strangled to death, and just months after that, a fourth woman was found strangled to death. For decades, their families searched for answers to no avail. Join senior crime reporter Nancy Hixt as she shares how a team of cold case investigators uncovered shocking evidence nearly 50 years later that led them to a serial killer.