Gwent Police has released new pictures of missing Newbridge man Kyle Vaughan and his car, and reiterated its appeal for information.
The last reported sighting of the 24-year-old was on the A467, between Risca and Crosskeys, between 11pm and 11.45pm on Wednesday 30 December 2012. It's believed he was wearing a dark coloured beanie hat, a dark coloured t-shirt, denim shorts, white trainers and a gold chain.
A 27-year-old man arrested on suspicion of murder, and a 21-year-old man and 15-year-old boy both arrested on suspicion of assisting an offender remain in police custody.
Officers are appealing for anyone with information to contact them.