Dante A. Alexander, 30, of Madison, Wisconsin, who was driving the 2014 Buick Regal involved in the incident, was found dead on the scene, police said.
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The car had been traveling south in the left lane on Interstate 94 at 159th Street just after 3:20 a.m. when, for unknown reasons, it hit the median concrete barrier, ISP said.
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Then, the car traveled across the southbound lanes and hit the guardrail on the right shoulder, police said.
The driver and two others inside the car were ejected.
A 21-year-old Sun Prairie, Wisconsin woman and 29-year-old Evergreen Park man were seriously injured in the incident.
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All southbound lanes reopened just before 9:40 a.m.
Police said the cause of the crash is not yet known, and asked anyone who has knowledge of it to contact them at 847-294-4400 or ISP.CrimeTips@Illinois.gov.
The video in the player above is from an earlier report.