Madison County authorities said an autopsy Friday gave no clear evidence of what caused the death of a 50-year-old man whose body was found in a lagoon in Granite City.
The body of James J. Marchioro was found Thursday afternoon in water near Illinois 3 and St. Thomas Road.
The body was found by a mowing crew about 1:45 p.m. The man was found lying near the edge of a roadway drainage ditch and lagoon off Illinois 3. He was pronounced dead at the scene.
Marchioro had been a resident at the nearby Chestnut Health Systems facility in Granite City, but had been reported missing by family members on Sunday. Chestnut Health provides addiction treatment and mental health services, along with other services.
An autopsy conducted Friday morning failed to reveal a conclusive cause of death, said Madison County Coroner Steve Nonn.
Nonn said a background investigation and further analysis would be conducted. The autopsy did not reveal any clear evidence of violence or foul play, Nonn said. Routine alcohol and drug studies will be performed as part of the investigation, he added.
The Granite City Police Department is also conducting an investigation.