A Chicago man and woman were killed in a crash early Sunday in south suburban Posen.

At 12:27 a.m., officers responded to a three-car crash at 147th Street and Western Avenue in Posen and found an unresponsive man and woman, according to the Cook County medical examiner’s office and Posen police.

Darius A. Stewart, 34, and 32-year-old Robin A. Kelly were dead at the scene, according to the medical examiner’s office. Stewart lived in the Southwest Side Chicago Lawn neighborhood, and Kelly lived in the South Side Woodlawn neighborhood.

Autopsies Sunday found both died of multiple injuries in a motor vehicle collision, and their deaths were ruled accidents.

The driver of the at-fault vehicle was taken to a hospital and is being treated for serious, but non-life-threatening injuries, police said. The two people in the third vehicle were not injured.

The crash investigation is ongoing, police said.