 comic style in the clubs on Hollywood's Sunset Strip in the 1970s. He had a small role in the Norman Lear-created TV series Mary Hartman, Mary Hartman, and became the star of its spin-off, the satirical talk show Fernwood Tonight. In the 1980s, he appeared in films including Mr. Mom and Clue, and in the 1990s was a regular on Roseanne. He later had acclaimed guest roles on Arrested Development and Veep, which got him an Emmy nomination. Mull was 80 years old.