The crash happened around 6 p.m. Friday near Church Road and Meadow Road in Winnetka, the Cook County Sheriff's Office said.
Two female pedestrians were at the location with an infant in a stroller when a vehicle hit them, the sheriff's office said. Both women died, officials said. The child was taken to a hospital in critical condition.
On Saturday, one of the victims was identified as Sediqeh Samadi, 37, by the Cook County Medical Examiner's Office.
Raziyeh Sigary, 58, was identified by the medical examiner as the second woman killed in the crash.
Officials haven't said if or how the deceased women and the injured infant are related.
The driver of the vehicle and a passenger were also taken to a hospital in good condition, officials said.
Investigators are looking into the crash said there is no indication of foul play; although, it's still unclear if driver error or a mechanical or medical issue caused the crash.
No further information was immediately available.
Chicago-based Abbott Laboratories said in a statement that one of its employees was killed in the crash.
"We are heartbroken by the death of one of our employees. Our thoughts are first and foremost with the family, who we will support during this difficult time," the statement said.