Oil City Police are continuing to build a time line in the investigation into a murder-suicide. 

Venango County Coroner Christina Rugh says Keriann Beach, 25 and Corey Walters, 28 each died of a single gunshot wound to the head. Rugh says the two were discovered around 10:30 a.m. Saturday. It's believed the the crime happened hours earlier between 3 a.m. and 7 a.m. 

The gunfire went off at the home of Walters, located at 24 1/2 Hone Avenue in Oil City. A 911 call sent officers to the scene. The coroner says Walter's ex discovered the bodies when he arrived for a custody exchange. 

Oil City Police Chief Robert J. Wenner, says the investigation shows that Walters fired one shot into Beach, then shot and killed himself.