The family of Lisa Dorrian is today marking the anniversary of her disappearance by insisting that those guilty will face justice in court.
Ms Dorrian (25) was last seen at a party in a caravan park in Ballyhalbert, Co Down.
There has been no sign of her since, despite a series of appeals, a high-profile investigation and the inclusion of the case on BBC's Crimewatch programme.
The family of the missing woman, who is presumed murdered, is now focusing on a billboard campaign aimed at triggering the remorse of those behind her killing. A website, www.lisadorrian.co.uk, was established last December.
In addition to Lisa's biographical details, the site has a facility for the posting of anonymous tip-offs about her whereabouts.
The PSNI believes her body was moved and possibly dumped at sea. As the family prepared for today's anniversary of Lisa's disappearance, her sister Joanne said they were determined the guilty would "not get away with it" and would "be dealt with by the courts".
Lisa, described as a vivacious woman who lived to go clubbing, had moved from the family home to share a flat in Bangor with a friend.
There were concerns that she had become involved with new friends and may have been introduced to drugs.
It is suspected that those who know about the killing may have links with the Loyalist Volunteer Force, which has since announced it is standing down.