CHICAGO (CBS) — A 27-year-old man died early Saturday after falling out of a limo bus and being struck by an SUV on Interstate 294 near north suburban Deerfield.

A 2012 Freightliner Truck Tractor limo bus was traveling south about 3:05 p.m. on I-294 at Lake Cook Road when James J. Larsen went to the front of the limo to turn up the radio volume, according to Illinois State Police.

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Larsen lost his balance, fell down the stairs and out of the limo bus’ door onto the pavement, where he was struck by a black SUV, police said. The SUV didn’t stop and continued driving north from the scene.

Larsen, of Libertyville, was pronounced dead at the scene, police said.

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An autopsy Sunday found Larson died of multiple blunt force injuries when he was struck by a motor vehicle after falling from another moving vehicle, and his death was ruled an accident, according to the Cook County medical examiner’s office.

The crash investigation is ongoing.

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