A man called police Thursday afternoon in south suburban Glenwood to say that he had killed his wife and son, authorities said.

Officers responded to the call about 3 p.m. in the family’s home in the 800 block of East 194th Street, according to Glenwood police Chief Demitrous Cook.

“He called and said he was inside the garage and had killed his wife and son,” Cook said. “He didn’t give a reason.”

When officers arrived at the single-family home, they found the man’s son and wife on the second floor, Cook said.

The Cook County medical examiner’s office identified them as 33-year-old Irven S. Williams and 68-year-old Delphenia Williams.

Autopsies Friday found both died of blunt force injuries to their heads in an assault, the medical examiner’s office said. Their deaths were ruled homicides.

Before officers found the victims, they entered the home through the garage door, which was cracked open, Cook said. They discovered the man who called them hanging out of a car inside the garage, unconscious and suffering from what appeared to be self-inflicted cut wounds.

He was taken to St. James Health in Chicago Heights and was expected to survive, Cook said. Charges against him were pending.

Cook said police have been called to the home in the past, but did not say what for.

“We haven’t had a homicide the whole time I’ve been here,” Cook said of the seven years he’s been police chief. “It’s a tragic incident. It’s a quiet town.”

Illinois State Police and the South Suburban Major Crimes Task Force were assisting with the investigation.