A 48-year-old man has appeared before a special sitting of Ballina District Court in Co Mayo, charged with the murder of Sandra Collins.
He has been named as Martin Earley, with an address at Bannagher, Carrowmore-Lacken near Killala.
Mr Earley has been remanded in custody to appear before Harristown District Court on Friday, 4 January.
The family of Sandra Collins were in court today.
Ms Collins, 29, went missing on 4 December 2000.
She had left her aunt's house where she was living to go to a nearby takeaway.
An investigation was launched and there have been a number of appeals.
Gardaí renewed an appeal for information on the tenth anniversary of her disappearance and significant progress was made.
Martin Earley was arrested yesterday evening while was on a return home from Britain, where he was working.