Architect Graham Dwyer, who is charged with the murder of Elaine O'Hara in August last year, has been refused bail by the Supreme Court.
Mr Dwyer had appealed against the High Court's decision to refuse him bail last month.
He is accused of the murder of Ms O’Hara, a childcare worker whose remains were found in the Dublin Mountains in September, more than a year after she went missing.
Mr Dwyer was in court for the appeal hearing.
Reporting restrictions were imposed on the High Court proceedings and the proceedings in the Supreme Court.
The hearing lasted about an hour.
After a short break to consider their decision, Chief Justice Ms Justice Susan Denham announced that the court was upholding the High Court's decision to refuse bail.
Mr Dwyer is due before the district court again on 15 January.