The crash happened just before 1 a.m. on Interstate 294 near Central Road in north suburban Glenview, police said. A white passenger vehicle and a FedEx truck struck the victim, who the Cook County Medical Examiner's Office said is a 31-year-old woman from Des Plaines.
The white passenger vehicle fled the scene, but police later located it and placed its driver in custody.
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The pedestrian was found on the side of the road.
FedEx released a statement about the crash, saying, "our thoughts are with the family and friends of those involved in this tragic accident. We are cooperating fully with investigating authorities."
State police are investigating the incident and did not immediately provide further information about the crash.