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Currently you are able to watch "Magnum, P.I." streaming on The Roku Channel for free with ads or buy it as download on Amazon Video, Microsoft Store, Apple TV.
A private investigator who works when he wants, lives in a beachfront estate in Hawaii, drives a posh Ferrari, runs up an unlimited tab at a swank bar, and charms attractive women in peril - that's the lifestyle of Thomas Magnum, aka Magnum, P.I.