Twenty-three-year-old Ashley Johnson was indicted on three counts of accessory after the fact of first degree murder. She turned herself in Tuesday.
Deputies said Johnson is the girlfriend of Willie Whitehead Jr. He's one of the men charged with the murders.
Authorities said three workers, including a 16-year-old boy, were killed during a robbery at the convenience store in April.
One of the victims was declared dead at the store. The two others died later at the hospital.
The dead were identified as 26-year-old Nabil Nasser Saeed Al'mogannahi, 24-year-old Gaber Alawi, and 16-year-old Mokbel Mohamed Almujanhi. The teen -- who was a student at nearby Farmville Central High School -- was the store owner's son.