Gardai have arrested a man in his 60s in connection with the abduction and disappearance of Charles Brook Pickard in 1991.
The 43-year-old father of four disappeared on the 26th april from Castlecove in Killarney Co Kerry.
Originally from England he had been living in Ireland for a number of years.
Gardai have made a number of appeals for information throughout the years as part of their long-running investigation.
The man was arrested yesterday evening and is being held at Killarney garda station.
He can be held for up to 72 hours.