Three people, arrested in connection with the disappearance of Marie Kilmartin, have been released without charge.
A man in his 40s and a woman in her 60s being detained in Tullamore Garda Station were released without charge last night.
A file is being prepared for the Director of Public Prosecutions.
Another man in his 60s being questioned at Portlaoise Garda Station was released earlier yesterday evening with a file also being prepared for the DPP.
Marie Kilmartin's body was found in a bog drain in Offaly in June 1994.