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Currently you are able to watch "Most Evil - Season 1" streaming on Amazon Prime Video, Amazon Prime Video with Ads, Discovery + or for free with ads on Tubi TV, The Roku Channel. It is also possible to buy "Most Evil - Season 1" as download on Apple TV, Amazon Video.
This is a countdown of the "most evil" serial killers based on an "evil" matrix developed by eminent Columbia University professor Dr. Michael Stone. Stone is a forensic psychiatrist and personality expert, who developed "The Stone Scale," also known as the "Gradations of Evil."