A medical emergency caused a driver to become incapacitated, prompted her passenger to grab the steering wheel and swerve, hitting and killing a mother and adult daughter walking on a Winnetka street and injuring a four-month-old baby, according to results of the Cook County Sheriff’s Office reports.

The crash killed Sediqeh “Asra” Samadi, 37, of Kenilworth, a chemical engineer who worked at Abbott Labs, and her mother, Saeideh Sigari, a 58-year-old teacher who was visiting from Iran. It also sent Samadi’s four-month-old son, Yusuf, to the hospital in critical condition.

The Sheriff’s office issued a statement saying it had interviewed the driver and passenger of the vehicle and witnesses, and reviewed records and medical and toxicology reports.

“At the conclusion of the investigation

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