Police are appealing for information after a 29-year-old man was found knocked unconscious in the Market Place in Richmond in the early hours of Friday 5 October.
Ambulance service contacted police at 12.30am with a report of a serious assault on a man who was found with injuries to his head, outside of the Town Hall Hotel.
He was taken to Darlington Hospital for further treatment, which resulted in him undergoing surgery for a fracture cheekbone.
Police are keen to identify a man who was seen in the area at the time of the assault, who may hold information that is important to the investigation
He is described as 5ft 9in tall, with dark hair and was wearing a black t-shirt with a shiny logo the front.
Anyone who recognises the description of the man, or who witnessed the incident is asked to contact police on 101, select option 1 and pass the information to the Force Control Room.
Please quote reference 12180186005.
Alternatively Crimestoppers can be contacted anonymously on 0800 555 111.