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Melissa Joan Hart Remembers 'Sabrina the Teenage Witch' Costar Martin Mull

Melissa Joan Hart paid tribute to Martin Mull, who starred as Principal Willard Kraft in the Hart-led series 'Sabrina the Teenage Witch' from 1997-2000, shortly after his daughter announced his death on Friday.

Looking back at their off-camera bond, Hart posted a throwback photo of her and Mull posing in costume together on set. Melissa Joan Hart and Martin Mull on set of 'Sabrina the Teenage Witch' in 1997.Jerry Fitzgerald/Disney General Entertainment Content via Getty "He once told me that he takes every job he's offered just in case the train comes to an end, which in this business tends to halt quickly," wrote Hart.

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