Elizabethton Police said they arrested a suspect in the Tuesday robbery of the Sonoco store at 1258 Milligan Highway.
Officers said a man stormed into the store about 7:36 p.m. on Tuesday, threatened the cashier, and demanded money from the register.
Police say the man left the business with money. Witnesses told officers they saw someone run from the convenience store, then get into a car parked nearby.
Elizabethton Police identified the suspect as Aaron Wallace, 30, of Unicoi, Tennessee.
Johnson City Police arrested Wallace at a home on North Barton Street. He is charged with one count of aggravated robbery.
He is due back in court on March 4.