A Man Accused Of Holding Up An Erwin Convenience Store Has Been Arrested In Unicoi County. 23 Year Old Ronnie Grindstaff Jr. Is Charged With Aggravated Robbery And Aggravated Assault. It Happened At The Quick Stop Market Around Seven O’clock Last Night. A Man Walked Into The Business, Pulled Out A Gun And Demanded Money. He Allegedly Threatened Two Clerks With The Weapon. Grindstaff Will Be Arraigned Next Week In General Sessions Court.