An appeal for information has been issued on 25th anniversary of the disappearance and murder of Jo Jo Dullard in November 1995.
Last month, following a review by the Garda Serious Crime Review Team and the National Bureau of Criminal Investigation, the case was upgraded to a murder investigation.
Gardaí believe that serious harm came to 21-year-old Ms Dullard, from Callan, Co Kilkenny, who went missing from Moone, Co Kildare, on or around the night of 9 November 1995.
They are appealing to anyone who met or saw her that night, or has any information in relation to her murder and who has not spoken to gardaí to please come forward.
She was working in Callan in Co Kilkenny and travelled to Dublin on the day she went missing, where she spent time in Bruxelles Bar on Harry Street, just off Grafton Street.
She missed the last direct bus home that night and got a bus to Naas before hitching two lifts to get to the village of Moone.
While she was in a phonebox in Moone telling a friend where she was, a car stopped for her and that was the last anyone heard from her.
She had her Sanyo stereo cassette player (model MGP21) with her at the time of her disappearance.
Gardaí are asking for people to contact them if they saw her cassette player after 9 November 1995, or received such a cassette player from a friend or someone who could not tell them where they got it from.
They are also appealing to anyone to come forward who was hitch-hiking in the immediate area around Moone, at the end of October 1995 or the start of November 1995, or anyone who may have given a lift to a hitch-hiker around the same time in the Moone area.
Anyone with any information can contact Kildare Garda Station on 045 527 730 or any garda station, or anyone who wishes to provide information confidentially should contact the Garda Confidential Line on 1800 666 111.