A victim of assault could face life changing injuries after being punched by a man in a Carlisle nightclub.
The attack happened in the corridor of Queens Bar on Botchergate in the city, on Saturday 23 December.
Police have now released CCTV to assist the investigation, and are keen to speak to the man pictured.
The victim, a man in his late 30s, was punched by a man in his 40s while he was stood with friends.
The offender made off from the bar seconds later.
The victim was taken to hospital with serious injuries that are reported could have a lasting-effect on his health.
Anyone with any information is asked to call 101 quoting incident number 65 of 23 December.