Advances in forensic science could yet solve the mystery of the disappearance of Wexford teenager Fiona Sinnott nearly two decades ago, gardaí believe.
The 19-year-old mother-of-one went missing on February 8, 1998.
She was last seen socialising with friends at Butler's pub in Broadway near Rosslare.
Her disappearance was initially treated as a missing person case.
However, following a review it was upgraded to a full murder inquiry in 2005.
Investigators are now set to launch a fresh forensic investigation on the Rosslare home Fiona shared with her 11-month-old child using new techniques that could uncover evidence that was impossible to detect 19 years ago.
"With recent advances in DNA technology, we are able to locate and generate DNA profiles from stains that were previously not possible 19 years ago," said Dr Dorothy Ramsbottom of Forensic Science Ireland, formerly known as the Garda Forensic Science Laboratory.
The case is set to feature on RTÉ's 'CrimeCall' tonight, and gardaí will again appeal for help from the public as they try to piece together Fiona's last known moments.
Gardaí have carried out an exhaustive investigation with more than 400 statements taken, the Our Lady's Island Lake in south Co Wexford drained, and quarry and land searches carried out.
Fiona's mother Mary and sister Diane will tell 'CrimeCall' of the trauma the family has suffered.
"My father died of a broken heart. He died never finding his daughter," Diane said.
"It's just not right, so we're just pleading for anyone with information to come forward, to let us bury her," she said.