CLEVELAND, Ohio -- The man who discovered the body of the brother of Cleveland's police chief said that the victim's girlfriend admitted to pulling the trigger, according to a 911 call released Thursday.

The man sounded shaken during the 3 a.m. phone call as he told dispatchers that William D. Williams lay dead with a gunshot wound to his head inside a Grantwood Avenue home.

Williams, 34, shared the home with his 36-year-old estranged girlfriend, Dana Johnson.

"His girlfriend killed him," the 911 caller said. He later said "I know she did it. She said she did it."

The man said Johnson was acting "erratic," and he called 911 because he thought someone might be hurt inside the house. Dispatchers stayed on the line as the man walked inside and found Williams' body.

Police immediately began searching for Johnson's car. Her cellphone pinged off of a reception tower in Euclid, then again in Pennsylvania, according to police incident reports.

Pennsylvania State Police stopped Johnson on a highway northwest of Pittsburgh. As officers approached her car, Johnson shot herself. She was rushed to a hospital, where she died Thursday morning.

9-1-1 call

Williams is the younger brother of Cleveland Police Chief Calvin Williams, who has decried the same gun violence that has now hit his family since assuming the reins of the department last February.

William Williams' relationship with the department his brother oversees remains unclear. He has had previous run-ins with Cleveland police officers, including cases involving allegations of domestic violence. He railed against police in posts on Facebook, and a sign on his front window warned officers against trespassing on his property.

But underneath that sign on the front porch sat a child's toy police cruiser.