Adam Joseph Decker, 34, initially told 911 dispatchers he had accidentally shot his live-in girlfriend at 107 M Coffey Lane, the sheriff said. M Coffey Lane is in southern Washington County just below the Nolichucky River near Erwin.
Deputies arrived to find Kristi Calli Breland, 30, dead in the kitchen and Decker in the dining room.
Graybeal said Decker admitted during questioning to having shot Breland after an argument. Evidence was also found in the home suggesting domestic violence had taken place moments before the shooting.
Decker was charged with first-degree murder. He was held in the Washington County Detention Center on $80,000 bond awaiting a Sessions Court hearing set for Monday.