A man in his 50s arrested in connection with the disappearance of Jo Jo Dullard has been released without charge.
Gardaí said they are continuing to search land in Co Wicklow for human remains.
Ms Dullard went missing 29 years ago as she was on her way back to Kilkenny from Dublin on 9 November 1995.
The 21-year-old was hitchhiking home to Kilkenny, and took a lift at Moone in Co Kildare, and has not been seen since.
The missing persons investigation was upgraded to murder four years ago.
A 55-year-man was questioned for a second day today after he chose to rest overnight.
He was released from garda custody this afternoon and a file is expected to be sent to the Director of Public Prosecutions.
Gardaí searched the lands in Ballyhook, Grangecon in Co Wicklow for a second day, as part of the murder investigation.
Access roads remained closed as heavy machinery is being used.
The site comprises agricultural land with outhouses, sheds and other buildings, some of which have already been searched.
The area is only 11km from Moone, where Ms Dullard spoke to a friend of hers from a phone box and told her she had a lift. The drive to the site is 15 minutes from the phone box.
Gardaí are searching for human remains and any other evidence that could place Ms Dullard at that location, such as clothing or personal belongings such as her Sanyo stereo cassette player, which she had with her the night she disappeared.
There has been speculation that one person was responsible for the murders of a number of missing women in the midlands and east of the country in the 1990s, but detectives do not believe they are dealing with a serial killer in this case.
They say, however, it is not unusual for killers to keep something belonging to a victim, or fail to dispose of it fully, and evidence like that has solved many other cases.
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In November 2020, on the 25th anniversary of Jo Jo Dullard's disappearance, gardaí confirmed that the case was being classified as a murder investigation as they were satisfied that serious harm came to Ms Dullard on or about the night of 9 November 1995.
Gardaí have urged anyone with information to contact Naas Garda Station on 045-884300 or any garda station.
Anyone who wishes to provide information confidentially should contact the Garda Confidential Line on 1800 666 111.
Read more:
Missing to murder: The long search to find Jo Jo Dullard
What is known about Jo Jo Dullard's disappearance?
Appeal on 29th anniversary of Jo Jo Dullard disappearance
