The untold story of a Canadian corporate superstar's murder and why a killer roamed free for decades. W5 tells the untold murder story of a Montreal woman who was on a career fast-track in California. 

Sonia Herok-Stone was 30 and working for Levi-Strauss. Beautiful, adventurous and the mother of a four-year-old girl when she was found murdered in her home in 1981.  She had been strangled. W5’s documentary, Who Killed Sonia details how a killer managed to stay free for 40 years and the shocking list of mishaps that jeopardized evidence that was key to his conviction.

Program contains mature subject matter. Viewer discretion is advised.