The Eaton County Sheriff's Office has released surveillance pictures from the armed robbery at the Advance America store on Saginaw Highway Monday night.
The suspect is believed to be in his mid-20s and between 5'8" and 5'10" tall.
He was wearing a dark blue hooded sweatshirt, grey pants and a beanie.
Witnesses told deputies he threatened an employee with a knife and got away with cash.
Nobody was hurt.
Call the sheriff's office if you have any information.