Police were called to Highland Middle School, 310 West Rockland Road in Libertyville, on Tuesday after a school bus driver crashed into three parked cars | Photo: Google Street View.

The school bus driver that crashed into three parked cars outside a middle school in Libertyville died as a result of a heart attack Tuesday evening, the Lake County Coroner’s Office announced.

The Libertyville Police Department and the Libertyville Fire Department responded at 5:42 p.m. Tuesday to Highland Middle School, 310 West Rockland Road.

Police officers found a school bus driver unresponsive after crashing into three parked cars, Libertyville Police Lt. Ed Roncone said. Police began performing CPR on the driver, who was identified as Thomas Lee, 75, of Grayslake.

Paramedics arrived and transported Lee to Advocate Condell Medical Center in Libertyville where he was pronounced dead. The school bus did not have any children on it at the time of the crash and no one else was injured.

The Lake County Major Crash Assistance Team (MCAT) was called to assist the Libertyville Police Department with the investigation, Roncone said.

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The Lake County Coroner’s Office identified Lee Friday afternoon and confirmed he died from a heart attack, which he suffered prior to crashing the bus. Routine toxicology results are pending.

“I have known Tom for a number of years and this is truly a tragedy. I have been in close contact with his family and my sincerest condolences go out to them,” Lake County Coroner Howard Cooper said.