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Currently you are able to watch "Mark of a Killer - Season 1" streaming on Hayu, Hayu Amazon Channel.
There are no options to watch Mark of a Killer for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
All serial killers commit murder to satisfy their grand fantasies, but the murderers featured in "The Mark of a Killer," take it one step further, committing heinous acts that allow them to extend their fantasies and relive the excitement of their crimes again and again.