'Rugrats' & 'Newhart' Star Jack Riley Dead at 80

Jack Riley -- the voice of "Rugrats" fave, Stu Pickles, and co-star of "The Bob Newhart Show" -- has died of pneumonia.

Jack famously played Elliot Carlin, one Newhart's super neurotic patients, during all 6 seasons of the classic '70s TV sitcom.

More recently he was the father of Tommy and Dil Pickles in the "Rugrats" cartoon series and movies. Jack also starred in several Mel Brooks movies and had tons of guest roles on huge TV shows such as "MASH," "Happy Days," and 'Mary Tyler Moore.'

Riley's wife told Deadline, Jack passed away Friday in Los Angeles. He was 80.