The sheriff believes a man suffered a medical event prior to crashing into a rock at Route 173 and North Lake Avenue in unincorporated Antioch and later being pronounced dead at the hospital Sunday afternoon. | Photo: Woo-Sung Shim / Lake and McHenry County Scanner

Authorities say a man died at the hospital after he was found unresponsive following a possible medical-related crash into a rock near Antioch Sunday afternoon.

The Lake County Sheriff’s Office and Antioch Fire Department responded around 2 p.m. Sunday to Route 173 and North Lake Avenue in unincorporated Antioch for a report of a vehicle crash.

The sheriff believes a man suffered a medical event prior to crashing into a rock at Route 173 and North Lake Avenue in unincorporated Antioch and later being pronounced dead at the hospital Sunday afternoon. | Photo: Woo-Sung Shim / Lake and McHenry County Scanner

Deputies and firefighter/medics arrived to find a vehicle that crashed into a large rock, Lake County Sheriff’s Office Deputy Chief Christopher Covelli said.

The vehicle, a Kia Sedona minivan, crashed off North Lake Avenue just north of Route 173.

The sheriff believes a man suffered a medical event prior to crashing into a rock at Route 173 and North Lake Avenue in unincorporated Antioch and later being pronounced dead at the hospital Sunday afternoon. | Photo: Woo-Sung Shim / Lake and McHenry County Scanner

The driver of the Kia, a 52-year-old Antioch man, was found unresponsive, Covelli said.

Rescue personnel attempted life-saving efforts and transported the man to Advocate Condell Medical Center in Libertyville, where he was pronounced dead.

The sheriff believes a man suffered a medical event prior to crashing into a rock at Route 173 and North Lake Avenue in unincorporated Antioch and later being pronounced dead at the hospital Sunday afternoon. | Photo: Woo-Sung Shim / Lake and McHenry County Scanner

“Based on the investigation, it appears likely the man suffered a medical event prior to crashing,” Covelli said.

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The Lake County Coroner’s Office is conducting an autopsy on the man, whose identity has not been released yet.