Gardaí have launched a new public appeal for information on the disappearance of Deirdre Jacob, who disappeared in 1998.
Sunday 28 July will mark the 15th anniversary of Ms Jacob's disappearance from Co Kildare.
The young woman, who was 18 when she went missing, was last seen walking along the Barretstown Road, Roseberry, Co Kildare, from the Newbridge direction, at 3pm on 28 July, 1998.
Ms Jacobs was carrying a black canvas bag with a yellow Caterpillar (CAT) logo, which has never been found.
Commenting on the appeal, Superintendent Joseph Prendergast said: "Fifteen years on, we are very anxious to get some answers for Deirdre Jacob's family.
“If you have any information, I urge you to call Crimestoppers today."
Gardaí say the investigation into the student teacher's disappearance is still open and active.
Superintendent Prendergast said gardaí are keeping an open mind and pursuing all lines of inquiry.
Anybody with information can call Crimestoppers on 1800 25 00 25.