Lake County Sheriff's deputies responded to a crash involving two vehicles on Route 59 near Wilson Road around 8:50 a.m. Wednesday.
Investigators said Jaclynn E. Vos, 77, was heading west on Route 59 in a 1998 Subaru Outback. She lost control of her vehicle and swerved into the eastbound lanes. The Subaru struck a 2013 Chevrolet Sonic.
Vos, of the 39800-block of North Long Drive in Antioch, was not wearing a seatbelt, authorities said. She was pronounced dead at the scene.
The driver of the Chevrolet was rushed to Centegra Northern Illinois Medical Center in McHenry. The driver's injuries were not life-threatening.
An autopsy will be performed Thursday. The crash remains under investigation.