Gwent Police are continuing their appeal to find out what happened to Kyle Vaughan, who was last seen 11 years ago.
The Newbridge man disappeared on Sunday 30 December 2012, then aged 24, and did not return after leaving his home for the evening.
The car he was driving, a silver Peugeot 306, was involved in a single vehicle collision on the A467 between Crosskeys and Risca on the same day as his disappearance.
Detective Chief Superintendent Nicky Brain, Gwent Police’s head of crime, said: “Our investigation into what happened to Kyle that night in December remains very much active.
“Eleven years on, we remain in contact with Kyle’s family.
“This has obviously been an extensive enquiry and it remains with our major investigation team.
“Unfortunately, though, we still don’t have the answers we need and Kyle’s family so desperately want.”
On the evening of Kyle’s disappearance, it was believed he was wearing a dark coloured beanie hat, a dark coloured t-shirt, ¾ length denim shorts, white trainers, and a gold chain.
As part of this extensive investigation, we have conducted searches in around 40 areas, interviewed in excess of 200 people, received more than 180 intelligence logs and taken nearly 900 witness statements.
A missing person enquiry was initially launched which then became a murder investigation.
Det Chief Supt Brain said: “Any information we receive from members of the public is recorded and investigated.
“We’re still keen to receive any information that may assist our enquiries, however minor you may feel it is.
“Anyone with any information can call us on 101, send us a direct message on social media, or alternatively, you can call Crimestoppers anonymously on 0800 555 111.”
