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Less than 24 hours after Kirstie Alley’s children announced her passing at 71 years old, the cause of the Cheers star’s death has been revealed. According to PEOPLE, Kirstie Alley died of colon cancer. The late actress’s rep confirmed the news to the media outlet. The family shared Alley had been receiving treatment at the Moffitt Cancer Center in Tampa, Florida prior to her death.