GARDAÍ have made an appeal for information on the 22nd anniversary of the murder of teenager Raonaid Murray.
The 17-year-old was founded stabbed to death in the early hours of Saturday, September 4, 1999.
The case remains a mystery, with gardaí unable to establish a motive or identify a prime suspect, while the murder weapon has never been recovered.
They have now renewed their appeal for information, saying someone could "unknowingly be shielding a killer".
"The lack of a prime suspect largely arises from the fact that there has been no motive identified in this case," read a garda statement.
"Many of those who were then Raonaid's age are now parents themselves, some of whom may have children who are close to Raonaid’s age.
Alibi doubts
"We would ask them to reflect now, with the benefit of maturity and hindsight, on any information which may be of assistance to the investigation.
"If any person has any information which could assist gardaí in identifying a motive for the murder of Raonaid, and if any person has any doubts about the truth of an alibi already provided, we would appeal for your immediate assistance.
"You may unknowingly be shielding a killer."
'Utmost priority'
Raonaid had gone with a friend to Scott's pub in Dun Laoghaire on Friday, September 3, 1999 at 9pm after finishing work.
She left the pub at 11.20pm to go home and change, having made plans to meet her friend at a nightclub later that night.
The walk to her home in Glenageary should have taken her around 15 minutes.
Her body was found shortly after 12.30am just 500 yards from her home, with the teenager having suffered multiple stab wounds.
"The solving of this murder is of the utmost priority for An Garda Síochána and any information received will be treated with absolute confidentiality," added the garda statement.
Anyone with information is asked to contact the Incident Room at Dun Laoghaire Garda Station on 01 666 5000 or 01 666 5012, or the Garda Confidential Line, 1800 666 111.