Josephine Pender has appealed to the public to come forward with information to help gardai locate her daughter's body.
Gardai today renewed their appeal to the public in tracing the body of Fiona Pender, who went missing in 1996.
Ms Pender was last seen at her flat at Church Street, Tullamore at 6am on August 23, 1996.
At the time, the young woman (then 25) was seven months pregnant. She was described as being 5'5" in height with long blonde hair.
Her mother Josephine said on RTE's Crimecall tonight: "Fiona is a home bird and I need to bring her home."
The day before Fiona vanished, Josephine had been shopping with her for baby clothes and said “we were all thrilled” about the impending birth.
On the day her daughter went missing Josephine said “[she] just had an instinct that something terrible was after happening”.
“We had seen one another every day,” she said of their close relationship.
She appealed to members of the public “to do the right thing” and contact the authorities with any information they may have in relation to Fiona’s disappearance.
Fiona was wearing bright coloured clothing and white leggings and at the time of her disappearance.
Anyone with information is asked to contact Tullamore Garda Station on 057 - 9327600, the Garda Confidential Line 1800-666-111 or any Garda station.
Ms Pender's disappearance will be featured on Crimecall this evening in conjunction with a Crimestoppers Appeal.
Geraldine Gittens and Emma Jane Hade