The man was driving in the area of 81st Street and Beloit Avenue about 6 a.m. when he had a health episode while returning from the hospital, spokesman Ray Hanania said.
He lost control of his car and crashed into a pool near the Bridgeview Park District, the spokesman said.
RELATED: Illinois State Police chase out of south suburbs ends in East Chatham crash; 3 arrested: ISP
He was taken to Advocate Christ Medical Center in Oak Lawn, where he died.
The man was not immediately identified.
The Suburban Major Accident Reconstruction Team is responding to assist in the investigation.