Mars died in his Grenada Hills, Calif., home from pancreatic cancer. He is survived by two daughters and six grandchildren.
Following Mel Brooks' Producers, where Mars starred opposite Gene Wilder, he co-starred with Wilder in Brooks' 1974 spoof Young Frankenstein as a police inspector with a malfunctioning artificial arm.
He went on to appear in numerous films, including Butch Cassidy and the Sundance Kid, Radio Days and What's Up, Doc? His television credits include Malcolm in the Middle, Columbo and Star Trek: Deep Space Nine.