A CCTV image has been released relating to a serious assault in a Skegness nightclub on August 26.
Officers would like to speak to the man pictured in connection with the incident and they believe he is from the Sheffield area.
A 23-year-old man was left unconscious after being punched in the face and upon being taken to Boston Pilgrim Hospital he was found to have suffered a fractured skull.
Police and an Ambulance were called to LA Cafe nightclub at around 4:45am.
Anyone with information about the man's identity is asked to contact DC Dave Ziller, at Skegness CID, by calling 101.