After retiring from baseball, Heilmann ran unsuccessfully for the office of Detroit City Treasurer and operated a semipro baseball team in 1933 and, in 1934, began a career as a radio broadcaster. From 1934 to 1941, he was play-by-play announcer for the Tigers on station WXYZ and the Michigan Radio Network, covering parts of Michigan located outside metropolitan Detroit, while rival Ty Tyson called games for station WWJ in Detroit exclusively. From 1942 to 1950, Heilmann was the exclusive radio voice of the Tigers throughout the state. Heilmann died from lung cancer in July 1951; he was posthumously elected to the Baseball Hall of Fame six months later in January 1952 after garnering 86.75% of the votes.