Deputy Liquor Commissioner and retired police officer Rick Goepper died Sunday.
Mayor Bob O'Dekirk said he did not know the cause of Goepper's death.
"He collapsed at the Moran club," O'Dekirk said.
Fire Chief Greg Blaskey said paramedics were called to the Moran club at 6:45 p.m. Goepper no longer was breathing or showing a pulse when they arrived, and CPR already was being performed, Blaskey said.
Goepper, 72, was president of the Moran Athletic Club, a social club located at 1207 Nicholson St.
He was employed as a deputy liquor commissioner since 2015, working for the mayor who also serves as the city's liquor commissioner.
Goepper previously was an officer with the Joliet Police Department for 27 years and retired as a master patrol officer.
"He was a guy that I think most Joliet policemen looked up to, especially the younger officers," O'Dekirk said. "When I became mayor, I made him a deputy liquor commissioner. He did a great job. He knew everyone in town. He's going to be missed."
Details about the circumstances of Goepper's death were not immediately available. Staff at the Moran Athletic Club said they would not comment out of respect for Goepper's family.