Excerpts from nbcchicago.com:

A Chicago firefighter was among two people killed when police say the car he was traveling in collided with another vehicle on Interstate 57.  According to Illinois State Police, 55-year-old Brian Schofield, of Chicago, was killed in the two-car crash that also left another driver dead. 

The accident happened when a Hyundai sedan collided with a Jeep head-on near 183rd Street. A preliminary investigation showed the Hyundai was traveling southbound in the northbound lanes at the time. The Hyundai struck a guardrail at a high-rate of speed and became engulfed in flames. Both drivers were pronounced dead at the scene. 

Police noted that seatbelts were not used during the crash.