A renewed appeal has been made for help to solve the murder of Ms Raonaid Murray, who would have been 21 yesterday.
Ms Murray, from Silchester Park, Glenageary, was attacked and killed close to her Co Dublin home on September 4th, 1999.
She was stabbed several times at about 12.10 a.m. and was found about 20 minutes later.
Gardaí interviewed more than 9,000 people and took more than 3,000 statements but are still waiting for a breakthrough.
Yesterday, a Garda spokesman said it was likely someone knew something about the incident, and a new appeal might encourage them to come forward.
Two years after her death, gardaí issued another appeal for help. At that time they were looking for several young men who were seen in the area at various times on the night of the murder. The Garda spokesman said that these people were still encouraged to come forward.
Gardaí want to speak to anyone who may have information about Ms Murray's whereabouts between 11.20 p.m., when she left Scott's public house in Dún Laoghaire, and 12.30 a.m., when her body was found at Silchester Crescent.
The attacker may have had blood on his clothes and gardaí have asked if anyone saw a relative returning home in this state.
Gardaí are still trying to identify a man reportedly seen arguing with Ms Murray on Corrig Avenue on the night of the murder. He was about 25 years of age and 5 feet 2 inches tall with an "Oasis" haircut.
Four young men were seen walking some distance from Ms Murray on the night, a number of them eating chips. Another young man was seen walking ahead of her on Glenageary Road.
A young man was seen running from Silchester Crescent at the time of the murder. He was about 20 and neatly dressed with short curly hair.
Gardaí want to speak to all these men. They also wish to speak to four men who got a taxi from St Stephen's Green on the night of the murder. One left the taxi in the Silchester/Glenageary area while the others went to Monkstown and Dalkey.
Two years after Ms Murray was killed, her family issued an appeal for information. "By keeping quiet, you are allowing Raonaid's murderer to walk free. By your silence, you are allowing the same thing to happen again," the family said. A €150,000 reward for information leading to her killer remains unclaimed.
Anyone with information is asked to contact the detective unit at Dún Laoghaire Garda Station on 01-6665012 or any Garda station.
