He had been hospitalized with a "serious, but stable medical condition," according to his son Christian Gregory. Christian Gregory had posted details about his father's illness on his dad's Instagram account.
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Gregory had fallen ill on Aug. 9, was hospitalized for a short time and then released before going back on Aug. 12, according to a post.
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Gregory started his career as a comedian while serving in the military in the 1950s. He then went on to to appear on television. During the 1960s, Gregory began fighting for civil rights.