Detectives investigating the murder of 55-year-old Pat McCormick have released images of a blue Ford Transit van they wish to trace.
The father of four was last seen alive in Comber, Co Down on the evening of Thursday, May 30.
Crimestoppers has offered a £10,000 reward for information which leads to the recovery of his body.
Detective Chief Inspector Pete Montgomery, who is leading the investigation, said: “I believe Pat was murdered in or around the vicinity of flats in Castle Street, Comber sometime after 10.45pm on Thursday, May 30.
“I have CCTV footage showing him walking across Castle Street, where he goes under an archway that leads to some flats. This is the last sighting of him on CCTV to date.
“I would still like to trace the movements of a blue Ford Transit van registration number JLZ 1672 and I would appeal to motorists and pedestrians to think back to the following specific dates and times:
• On May 30 at approximately 11.30pm heading country bound on the Killinchy Road. Did you see this distinctive van with the silver front wings? Where did it go?
• On May 31 at around 8.15am in the rear car park of Supervalu. Did you see the van parked up here? Did you see the driver? Did you see anyone at the van or any activity at the van? Later on at around 10.15am did you see it on the Killinchy Road heading in the direction of Lisbane? Did you see where it went?
• And later that day at around 2pm did you see it travelling on the Old Ballygowan Road in Comber? I need to know where this van went.”
The senior investigating officer also made an appeal for people to look out for Pat’s distinctive mobile phone flip cover – black with red stripes – and his iPhone SE, which remains unaccounted for.