Deputies found the bodies of Robert Eugene Asmann, 62, and Marcia Collins Wood, 49, at Mr. Asmann's home in West Augusta a little before 6 a.m.
Ms. Wood, who lives next door, was found in the bedroom covered with towels and her arms lay crossed on her chest.
She had suffered a gunshot wound to the chest, according to Richmond County Chief Deputy Coroner Mark Bowen.
Mr. Asmann was found in the backyard with bed linens draped over his face and head and a silver handgun nearby, the report said.
He had a single gunshot wound to the chest.
Officials rushed him to the Medical College of Georgia where he died about 40 minutes later, Mr. Bowen said.
Sgt. Roundtree said the two had been involved in a relationship that had recently ended and Ms. Wood had come to the home to return some personal items.
"At this point in the investigation we believe it was a planned event," he said. "He left evidence in the house that points to this."
Notes addressed to members of Mr. Asmann's family and contact information for family members were found, according to a sheriff's report. A cell phone found lying in the yard matched the number that made the initial 911 emergency call.
"He made the call to 911 just before he shot himself," Richmond County Coroner Grover Tuten said.
In a statement, Shayne George, president and CEO of Doctors Hospital, mourned the loss of Ms. Wood, who had worked at the hospital for the last six years.
"We are deeply saddened to hear about this tragic event," the release said. "Marcia was an operating room nurse here at Doctors Hospital, where she was part of our family. We are keeping her family in our thoughts and prayers."
Reach Adam Folk at (706) 823-3339 or firstname.lastname@example.org.