Martin Mull got his start in the entertainment industry as a comedic musician and many of his best movies and TV shows ...

Steve Granitz/FilmMagic; Frazer Harrison/Getty; Matt Winkelmeyer/Getty Several stars are paying tribute to Martin Mull after his death ... and then you're doing a movie with them, you're like ...

Martin Mull, the comedian and actor best known for ... He also played Colonel Mustard in the 1985 movie Clue. He went on to appear on beloved '90s shows Sabrina, the Teenage Witch and Roseanne.