UPDATED 09/06/12 8:29 a.m.

CHICAGO (CBS) — Police are investigating a deadly shooting that happened overnight on the Dan Ryan Expressway.

Around 11:40 p.m. Wednesday, a Jeep Grand Cherokee wound up on 87th Street after someone shot the 25-year-old driver, who was trying to get on the southbound Dan Ryan, Illinois State Police said. The shots came from another vehicle that police have not been identified.

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“It happened right at the bottom of the ramps, southbound, just prior to the ramp to 87th Street, and the shots are believed to have come from a vehicle that was passing southbound on the Dan Ryan,” said Illinois State Police Master Sgt. Steve Tufenkjian.

Tufenkjian says the 25-year-old driver of the 2012 black Jeep Grand Cherokee was hit in the neck and killed. He is identified as Larry Porter.

Porter’s front seat passenger was grazed by a bullet in the eyebrow. A back seat passenger was uninjured.

The Jeep knocked over a light pole, went through a wrought-iron fence, and slammed into an auto parts store at 87th Street and Lafayette Avenue.

There is no word on what sparked the drive-by shooting.

State police believe the people in the Jeep all ranged in age from 25 to 27.

“It looks like we lost another 25-year-old man to gun violence at this time on the expressway,” said community activist Andrew Holmes. “We’re asking that if anybody was on the expressway, and you’ve seen a car with the license plates of these cars, please turn this over to the State Police or the Chicago Police.”

Police have not released any license plate numbers.

The ramp reopened around 5 a.m. Thursday, after all the debris was removed.

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