William Albert McMillan, 53, was shot to death on May 26, 2014, in Butner, North Carolina. He was found inside the home he shared with his longtime girlfriend, Mildred Michelle Hinton Davis, after Davis called 911 to report the shooting. Officers discovered McMillan had died of a gunshot wound to the head.

Neighbors described the couple as sweet and quiet; police said they had responded to domestic dispute calls at the residence several times previously. A handgun was recovered inside the home. Davis, 52 and a former mail carrier, was arrested at the scene, seated on the front steps, and charged with second-degree murder; she was held under a $100,000 secured bond.

What details about the household or prior calls might help explain how the dispute escalated to lethal violence?