Hundred attended the service to remember Lisa Dorrian

Lisa, 25, was last seen at a party on a County Down caravan site in February. Her body has never been found.

Police believe members of the Loyalist Volunteer Force may have been involved in her killing.

The Church of the Holy Redeemer in Ballyholme was filled to capacity for Friday night's service, which family members said was to celebrate her life.

Her mother, Patricia, said they wanted to mark the nine months since Lisa's disappearance and that someone must know something and must help them find her body.

"We just want Lisa back and I hope that with all the coverage we have had today and from this service tonight, it will prick somebody's conscience to lift the phone," she said.

It is assumed she was murdered by members of the LVF, which stood down on Saturday.

Lisa's mother, Patricia, called for help to find her body

Despite extensive searches her body has not been recovered and detectives believe it could have been hidden under water.

On Wednesday, it was confirmed that a forensic scientist looking at the cases of the Disappeared will also be able to work on Lisa's case.

The forensic scientist is being funded by the British and Irish governments to help locate the remains of five people abducted, murdered and secretly buried by the IRA during the Troubles.

Northern Ireland Secretary Peter Hain said the police would be able to use the scientist to undertake other work on an independent consultancy basis.