The family of murdered Bangor shop assistant Lisa Dorrian are considering re-mortgaging their home to treble the reward for information about her killing to £30,000 Sterling.
Ms Dorrian (25) was last seen at a party in a caravan park in Ballyhalbert, Co Down in February 2005. Despite extensive air, land and sea searches no trace of her has been found.
Her sister Joanne confirmed her parents, John and Pat, may boost the current reward of £10,000 in a fresh bid to secure a breakthrough in the case.
The reward will be separate from the Lisa Dorrian Appeal Fund which has financed a billboard campaign to raise the profile of the murder. Joanne said the family plan to discuss the proposal with their solicitor and the PSNI.
She said: "We are hoping to step up the campaign and show people that we are absolutely serious about bringing people to justice and getting Lisa's body back. "If people out there know who done this then £30,000 might be enough to make them come forward."
Joanne said the only way the family could fund the additional £20,000 would be to re-mortgage their Conlig home.
The initial reward was for information which might lead to the recovery of Lisa's body but the new fund is likely to pay out if someone is arrested and convicted. Joanne revealed the family were anxious to take the campaign forward, just weeks after the first anniversary of Lisa's disappearance.
She said: "We are trying to think of new things to do. "We want to show the people who done this to Lisa that we are not going to go away. "We just want to know where she is and leave justice up to the police."
In a fresh appeal for information last month the PSNI revealed they believe Lisa's body was dumped at sea. A number of people have been arrested in connection with the murder but no one has been charged.
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.