A man died of a heart attack before a rollover crash Friday morning near the Dan Ryan Woods Forest Preserve on the South Side.

At 11:34 a.m., the 55-year-old was speeding north in the 8600 block of South Western when he lost control, police said. The vehicle hit a pole and a tree before rolling over.

Craig E. King, was taken to Christ Medical Center in Oak Lawn, where he was pronounced dead at 12:30 p.m., according to police and the Cook County medical examiner’s office. He lived in the Park Manor neighborhood.

Autopsy results Saturday showed he died of a heart attack, according to the medical examiner’s office.

The police Major Accidents Investigation Unit is investigating the crash.