WHEATLAND, Ill. (STMW) – While the cause of death for a man whose body was found in his car submerged in a pond on a Will County golf course Friday has been determined, why the car plunged into the pond remains under investigation.

The body of James E. Daw, 54, of Naperville, was found in a car that was submerged near the 11th hole of the Tamarack Golf Course, according to the Will County Coroner’s office.

Daw was pronounced dead at 2:13 p.m. on Friday.

An autopsy on Saturday found that Daw drowned, but what caused the drowning was still under investigation, according to the coroner’s office.

Will County Sheriff’s police spokesman Pat Barry said it appears Daw had a medical issue or was involved in an unreported traffic accident late Thursday or early Friday.

“Debris from the vehicle was discovered around noon and divers discovered the car had traveled 88 feet into the water,” Barry said.

Reports said Daw lived nearby.

Police said there are no indications Daw’s death was the result of foul play.