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 Crime 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