 In the 1980s, he appeared in films including Mr. Mom and Clue, and in the 90s 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. When traffic takes a turn for the worse, you'll hear about it first on WTOP. Northbound 95 has been shut down. Traffic updates every 10 minutes on the 8th. I heard it on WTOP. WTOP News. Facts matter.