The 17-year-old was murdered while walking to her home in Glenageary, south Dublin, in September 1999.
Her body was discovered at Silchester Crescent, Glenageary, in the early hours of September 4.
The last definite sighting of the teenager was when she left Scotts pub in Dún Laoghaire at 11.20pm on September 3.
More than 8,000 people have been interviewed by gardaí and almost 3,000 statements taken. There were 12 arrests, but no one has been charged.
Jim and Deirdre Murray spoke yesterday of their ongoing heartache since their daughter’s violent death.
“She was a treasure to us. She was loving, caring, bright and beautiful,” said Ms Murray.
The Murrays are appealing for anybody with information about their daughter’s death to pass it on to them. They said they wanted to hear from anybody who had direct information, or even a suspicion about the person responsible for killing their daughter.
They said that time has stood still for them since the terrible day their daughter was repeatedly stabbed.
They said there could be people out there who didn’t come forward at the time but who may now be in a position to contact them with information.
The new website – www.raonaid.com – has an email facility and a phone number for people to contact the Murray family directly with information.