"Mr Brooks" (2007)

Earl Brooks is a man who has managed to keep his two incompatible worlds from intersecting by controlling his cunning, wicked alter ego Marshall. But now, as Mr. Brooks succumbs to one last murderous urge, an amateur photographer witnesses the crime. Suddenly Brooks finds himself entangled in the dark agenda of an opportunistic bystander, as well as hunted by the unorthodox and tenacious detective Tracy Atwood.