Three men remain under suspicion for the killing of teenager Raonaid Murray as the first anniversary of her death approaches without a conclusive break in the case. Gardai and the Murray family have made an appeal for new information.
"Someone out there knows some little thing. It is a big jigsaw and we're missing a few pieces," said Det Insp Eamon O'Reilly of Dun Laoghaire Garda station.
"We would renew our appeal for anyone who knew Raonaid Murray and who has not come forward to please come forward now," he added.
Monday marks the anniversary of the killing of the 17-year-old from Glenageary in Dublin. She had been repeatedly stabbed with a broad-bladed knife as she made her way home from Scott's pub at 11.20 p.m. with a view to returning to meet a friend and go to Paparazzi nightclub.
Her body was discovered at 12.40 a.m. on Silchester Crescent, 200 yards from her home. She had dragged herself a distance from the scene of the attack before dying.
Gardai stress they have not accounted for Raonaid's movements for half an hour before the attack, which occurred about midnight. They have asked anyone who may have seen her as she made her way home to come forward and have asked whether anyone gave her a lift or walked with her.
In a statement, her family asked people to remember their daughter had been viciously attacked and left alone to die in the dark. They were haunted by the horror of Raonaid's final moments.
"While Raonaid lies in her grave, her murderer is free to walk the streets. We know nothing will bring Raonaid back to us but the thought of her vicious killer roaming free adds to our agony," added the statement.
To date detectives investigating her death have taken in excess of 3,000 statements, have made more than 3,000 general inquiries and completed 5,000 questionnaires during house-to-house inquiries and at checkpoints.
Seven men have so far been arrested and three of these men remain suspects. Detectives are also trying to trace four men that they have never questioned and may be abroad. Another man they wished to question has been tracked to a jail in another jurisdiction and they will travel to question him.
Gardai are also trying to trace additional men including a group of men standing eating chips about midnight on the night of Friday September 3rd, 1999, at Lower Glenageary Road and two men walking ahead of her, one of whom had curly dark hair.
Detectives also wish to trace four people who took a taxi from St Stephen's Green, one of whom got out at Silchester Road, and a man who danced with Raonaid at a nightclub and later met her at a fast-food restaurant six weeks before her murder.
People have been asked to consider whether any person they know has been acting strangely or out of character since the incident or whether they know of any violent incidents with similarities to the attack on Raonaid.