https://people.com/melissa-joan-hart-remembers-sabrina-costar-martin-mull-after-his-death-8671599#:~:text=Melissa%20Joan%20Hart%20and%20Martin,the%20Teenage%20Witch'%20in%201997.&text=In%20her%20Instagram%20tribute%2C%20Hart,halt%20quickly%2C%22%20wrote%20Hart.

Melissa Joan Hart and Martin Mull on set of 'Sabrina the Teenage Witch' in 1997. In her Instagram tribute, Hart shared how Mull explained why he took so many roles. "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.