Toronto police are following a serial killer's trail of murder, but it has now been two weeks since their last update. That's due in part to the weather freezing temperatures have made it difficult for investigators to properly search for clues. With warmer weather in the near future, police are hopeful of unearthing more evidence. For The National Documentary, Ioanna Roumeliotis puts together what we know about the case so far, the suspect, and the trail of evidence surrounding Toronto's chilling murder investigation. Correction: A previous version of this story used an image that misidentified Bruce McArthur.
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