For more than 40 years, the man who killed a young Canadian mother in California roamed free. In 1981, Sonia Herok-Stone was murdered in her home. But she fought for her life, and in a dramatic twist, that fight has now sealed the fate of the man who took her life all those years ago.

The Millionaire Murders: Who killed Daniel Langlois and Dominique Marchand?
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Narco Jungle: The Darien Gap – One of the world's most dangerous migrant routes
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The Cult Queen: A charismatic leader holds a Saskatchewan town hostage
45:07