Police released CCTV images of a man who allegedly punched in the face another man on Sunday, October 30 at around 1.20am in McDonald’s on Ropewalk.
A 39-year-old local man suffered from a broken jaw and he was taken to Lincoln County Hospital and treated for his injuries.
The suspect is described as a white man in his early 20s.
He was slim and had short dark hair and was wearing a light blue zip-up jacket with black gloves, dark jeans or trousers and blue trainers. He was carrying a blue plastic bag.
Call Lincolnshire Police with information on 101, or call independent charity Crimestoppers anonymously on 0800 555 111.