Watch Series: The Mark of a Killer Released in (2019) - Season 1 produced by USA, The TV Series categorized in Crime, Documentary, and content rating TV-14 with duration 43 min Streamed at Putlocker All serial killers commit murder to satisfy their grand fantasies, but the murderers featured in this true-crime docuseries 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. - Season 1