Police in York have issued an appeal and CCTV image to find a key witness following a violent incident outside Popworld nightclub.
The suspects in this case have been identified and officers want to stress that the man they want to trace is not a suspect, but a witness who may be able to provide vital information.
The incident happened on 10 November at around 1am when a man suffered serious injuries during a violent disturbance outside the club.
The witness police officers want to speak with appears to be filming part of the incident and such footage may be vital in this case.
Officers are hoping that the man reads this appeal and gets in touch as he may be able to provide key information that could assist their investigation.
If you believe that you are the man in the picture, or you also saw the incident that morning, please get in touch.
Anyone with any information is asked to email carl.barnes@northyorkshire.police.uk or call 101, press option 2 and ask for PC Carl Barnes 887.
Please quote reference number 12230213697.
If you wish to remain anonymous, you can pass information to Crimestoppers on 0800 555 111.
One man has been arrested and released on bail while the investigation continues.