An investigation into the unexplained death of a 32-year-old man 15 months ago has been called to a halt by detectives.
Despite extensive inquiries police have failed to establish whether the killing of Shaun James was an accident.
Police say Mr James, of Cinderford, was probably hit by a car but suspect the incident may not have happened at the spot where he was found.
His family and friends are setting up a website to encourage new evidence.
Mr James was last seen talking to friends in Valley Road, Cinderford, just before 1900 GMT on Sunday 15 December 2002.
Minutes later his body with multiple injuries was discovered almost a mile away at Steam Mills.
At the time Gloucestershire Police offered a £5,000 reward for information leading to an arrest and conviction.
Mr James' partner, Lisa McStraw, together with his former wife, Stephanie James, are now determined not to give up the search for a solution to the mystery.
They feel police have not done enough and are making a fresh appeal for witnesses to come forward via the website, which has not gone live yet.
Police have said they will reopen the case if any further evidence emerges.