It happened just after 2 p.m. at a home in the 7300 block of Cedar Grove School Loop Road in Nashville.
A 41-year-old woman, Leasa Harper Smith, was found dead with a gunshot wound inside the home when deputies arrived on scene.
Authorities said her boyfriend, David Griffin Leonard, was arrested and charged with first-degree murder.
Leonard is being held in the Nash County Jail with no bond. He is scheduled to make his first court appearance Thursday.