The brother of a 22-year-old Laois woman who went missing in Waterford City twenty years ago has made an emotional appeal on bended knees for information on her whereabouts.

At the graveside of their parents in Mountmellick Co Laois, Donal Keenan said the family had to accept it was unlikely his sister Imelda would simply reappear two decades after she went missing.

He collapsed to his knees as he described how the family is seeking closure.

Imelda Keenan who was originally from Mountmellick, Co Laois went missing on Lombard Street in Co Waterford on 3 January 1994.

She was living with her boyfriend in an apartment on William Street in the town.

On the day she disappeared Imelda left her flat at 1.30pm and was last seen crossing the road at the corner of the Tower Hotel and Lombard Street.

There have been no further positive sightings despite a lengthy garda investigation into her disappearance.

Her niece, Regina Kerry said today that gardaí in Waterford had started to re-interview witnesses as part of Operation Trace.

She said the family was still distraught about Imelda's disappearance but somebody somewhere knows what happened to her and she was asking that person to come forward.