A murder inquiry that followed the disappearance of a man from his Surrey home 16 years ago has been reopened.
Andrew Elphick's body has not been found
Andrew Elphick, 21, took a day off from his job at Moss Bros in August 1991 and was never seen again. His unlocked car was found in Slough, Berkshire.
Four years later, fresh information led police to begin a murder inquiry - but there was insufficient evidence to charge anyone. No body was ever found.
Police say advances in forensic science could now help to reveal what happened.
Case review officers will be using a DNA profile of Mr Elphick which they have built using samples from his family.
The re-investigation will see police take another look at forensic exhibits, interview witnesses again and re-visit key locations.
Mr Elphick's father, Albert, described his youngest son, who lived in the village of Normandy, as lively, charming, optimistic, caring, and close to his brothers and sister.
He said: "As a family it has been difficult and painful to talk about because we have no conclusion."
He added it had been "too horrific" to talk about the disappearance, but the family had faced the reality that Mr Elphick was not coming back.
Albert Elphick, father of the missing man, welcomed the case review
He said he would "dearly hope" that anyone with any information would "have the decency to relieve the pressure on my family".
Mr Elphick's mother and grandparents died without knowing what happened to him, he said.
Det Insp Paul Monk said: "We owe it to Andrew's family and all those who knew him to do all we possibly can to explain his disappearance.
"His family are fully supportive of this re-investigation despite the tragic memories it will inevitably re-kindle."
He added: "Whoever killed Andrew obviously knows who they are and it is likely that others also know who they are."