CTV's W5 investigates serial killer Bruce McArthur, who took the lives of eight men in Toronto's Gay Village, and interviews Mark Henderson, his first known survivor.

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W5's Avis Favaro looks at a historic year in scientific development that lead to the creation of vaccines that scientists hope will stem the spread of COVID-19.

People with Lyme disease can suffer debilitating pain, robbing them of the life they had before they were bitten by a tick. W5 investigates Canada's problem with a disease that comes from a tiny parasite.

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W5 investigates what legalized single-game sports betting has looked like around the world and whether it’s worth the risks and rewards.

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CTV's W5 investigates the shadowy world of romance scammers and the so-called 'suckers list,' a key item fraudsters use to dupe victims again and again.

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Check back soon for in-depth investigations from the most-watched documentary program in Canada.