Published Tuesday, 10 September 2013
Mark Gourley, who was 36, was last seen in Glengormley in 2009.
A murder investigation was launched by the PSNI this week on the back of new information.
Detective Inspector Neil McGuinness, speaking to the press on Tuesday, said Mr Gourley had "associations with groupings" in the past and all lines of enquiry will be followed.
He said: "At the time of his disappearance Mark Gourley was not an active member of a paramilitary organisation. I don't believe he ever was a senior member of any paramilitary organisation although in his past he did have associations with groupings."
Mr Gourley was from the Castlemara area of Carrickfergus and was described as a "vulnerable individual" who was on medication when he went missing.
He was last seen at Burney's Lane in Glengormley at around 2.30pm on 7 March 2009.
At the time he had been wearing a black waterproof jacket with a grey design on the shoulders, black Umbro tracksuit bottoms and black leather trainers.
Mark was described as 5ft 9ins tall and of medium build, with fair cropped hair.
His right eyebrow is pierced and he has tattoos on his left shoulder and left forearm and a tattoo of his first name on his right arm.
Anyone with more information has been asked to come forward.
"Police believe that there are people in these communities who have knowledge of what has happened to Mark," continued Detective Inspector Neil McGuinness.
"People may have heard rumours about what happened to Mark. We would appeal to them to share this information with police. Alternatively, information can be provided anonymously to independent charity Crimestoppers by telephoning 0800 555 111."
© UTV News