Watch The Orphan Killer Full Movie Free Online 123Movies. The Orphan Killer is a tour de force murder flick that defies classification. It goes far beyond current trends in gore and breaks open a new suffering genre of horror. Marcus Miller is a serial murderer hellbent on teaching his estranged sister Audrey what it means to have family loyalty. His lessons are taught in massive doses of vulgar and unimaginable pain. Throughout her brutal torture we learn that Marcus is not the only Miller with Killer in the bloodline as Audrey proves to be a formidable adversary.