Detectives investigating the murder of Lisa Dorrian have questioned a man in his 20s, police have said.
Lisa Dorrian's body has never been found
The man was arrested on Tuesday and later released pending further inquiries, a PSNI spokesperson said.
The 25-year-old Bangor shop assistant was last seen alive at a party on a caravan site in Ballyhalbert, County Down, at the end of February.
The police are looking at the possible involvement of members of the Loyalist Volunteer Force in her killing.
In July, Prime Minster Tony Blair pledged his support in helping to locate her body.
Her family have already offered a £10,000 reward for information leading to the recovery of her body.