A man in his 50s has been arrested as part of the investigation into the murder of Willie Maughan and his girlfriend Anna Varslavane.
The couple, who lived together in Gormanstown, Co Meath, went missing on 14 April 2015.
They were on the way to meet Mr Maughan's mother to get a lift to Tallaght, where the Maughan family lived.
The couple had planned to leave Gormanstown to move back to the Tallaght area at the time of their disappearance.
Gardaí believe the couple were murdered on their way to meet Mr Maughan's mother, but their remains have never been found.
The man is being held at Ashbourne Garda Station for questioning.
He can be questioned for up to seven days. It is the first arrest in the five-year investigation.
Detectives along with members of the Serious Crime Review Team, Garda National Bureau Criminal Investigation, arrested the man this morning.
They have been investigating the activities of an organised crime gang based in the Louth/Meath area.
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