Richard Looey was walking his two dogs Sunday when one of them either jumped or fell into the water, The Chicago Tribune reported. Looey dove in but became entangled in large rocks near a seawall, witnesses said.
Someone called 911, but when a Fire Department helicopter arrived minutes later, the man was underwater and nowhere to be seen, said Larry Langford, a spokesman for the department told the newspaper.
Rescue divers brought the man to land about two minutes later. He had a pulse, but did not respond to resuscitation.
The fate of the dog was unclear, NBC5.com said Tuesday.
His wife of 25 years, Maria Looey, said her husband had legally changed his name to Baba Looey, as people had problems with his birth name of Richard Bogulewski.