DETECTIVES investigating the murder of a North Yorkshire man who had been on a stag do in Leeds have released CCTV images of three men they want to trace.

Robert Adamczyk, 28, an engineer from South Milford, is understood to have been hit by one of a group of three men and to have fallen, hitting his head on the ground, police said.

He was pronounced dead at Leeds General Infirmary on Sunday morning following the attack near to The Grand Theatre on the junction of Harrison Street and New Briggate shortly before 2am.

A post-mortem examination has since given the cause of death as a head injury.

Detectives have today released CCTV images of the three men they want to trace. They are seen going in to Space nightclub in Duncan Street after the incident.

Det Chf Insp Simon Atkinson, of the homicide and major enquiry team, said: “I cannot stress enough how important it is that we speak to these men at the earliest opportunity. We have spoken to a number of witnesses who were at the scene and we are currently reviewing a large amount of CCTV from a number of different locations. I am appealing directly to these men to contact us and tell us what happened before we come and find them. The longer they leave it, the worse it will get.

“A young man who was simply enjoying a night out has tragically lost his life and his family and friends are understandably distraught and are struggling to come to terms with what has happened.

“I would urge anyone who recognises these men or who has any information that could assist the investigation to get in touch immediately. We believe there were a number of people who went to Mr Adamczyk's aid at the time and we would also like to hear from them.”

Mr Adamczyk had been out in Leeds celebrating a friend’s stag night. He and one friend had left the group and gone to North Bar, in New Briggate. The incident occurred after he and his friend left the bar.

The three men involved in the incident went off towards The Headrow afterwards.

Mr Adamczyk is understood to have recently moved in with his girlfriend in Saxton, police said..

Anyone who recognises the men or who has any information is asked to contact the homicide and major enquiry team via 101 or call Crimestoppers anonymously on 0800 555 111.