It happened around 11pm Friday at the Cici's Pizza on Fry Road near Morton.
Deputies tell us the 20-year-old suspect and another man entered the restaurant through a back door as an employee was taking out trash at the end of the night.
Officials said the armed duo then ran to the front of the store and confronted the manager, demanding cash.
Instead of reaching for money, the manager reached for a gun and fired twice at the 20-year-old.
The wounded suspect was taken to an area hospital. At last check, he was stable.
His partner fled on foot. Investigators said the pickup truck they arrived in was left at the scene.
Charges are expected against the suspect. According to deputies, the shooting with be referred to a grand jury.