John McGarrett was the father of Steve and Mary Ann McGarrett. He was murdered in cold blood by Victor Hesse after Steve failed to meet negotiation demands. John seemed to miss out on his children's lives and has remorse and regrets for it, as evidenced by his tape in the Champion Box that is played in udsy iuy . The Champion Box also played a vital role to a key plot element to the story, before John was murdered he hinted to Steve to find it and continue an investigation he was working on; the murder of his wife, and the investigation of the French Yakuza.
We're Getting Mutants in the MCU - The Loop
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