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You can buy "Relentless 3" on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu as download or rent it on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu online.
Sam Dietz, the relentless police detective, returns to Los Angeles from a self-imposed exile to help the police solve another series of brutal killings committed by another crafty serial killer whom targets Dietz's latest love interest.