The murder of a 24-year-old doorman found dead on wasteland near Cambridge 18 years ago has been reopened after a "significant breakthrough" by police.
Ian Grant was found near Fulbourn Hospital in Cherry Hinton shortly after midnight on 15 November 1995. He had been shot in the back of the head.
Police said new forensic evidence had come to light.
Two men were charged with conspiracy to murder at the time and acquitted after a trial at Norwich Crown Court.
'Lot of enemies'
Det Ch Insp Jon Hutchinson said: "We have had a significant breakthrough, so much of a breakthrough that we've relaunched with a new investigation team.
"Ian was shot on wasteland close to what is now the Fulbourn Tesco.
"We know Ian was a doorman in the pub and club scene in Cambridge and we know he developed a lot of enemies.
"This was through incidents where he had demonstrated some violence and through disruption of other door companies at that time."
Mr Grant was last seen when he left his flat in nearby Speedwell Close on the night of 14 November.
His girlfriend's car had been set alight two weeks before his death.
Detectives believe that incident is linked to the killing.
Mr Hutchinson added: "Over time, allegiances change, and people who 18 years ago were too frightened to come to speak to police are now willing to do so.
"We know that a number of people were present the night Ian got shot, and that a number of those have never come forward.
"Come forward - do the right thing."