The Dun Laoghaire teenager had been socialising with friends on the 4th of September 1999 when she left them to walk home and disappeared.
Her body was found within hours at Silchester Crescent in Glenageary less than 500 yards from her house.
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Today Gardaí will renew their appeals for information – officers are seeking answers to two questions.
Who killed Raonaid Murray – and why?