Gardaí investigating the disappearance of Philip Cairns have not been able to forensically connect the convicted paedophile Eamon Cooke to the missing schoolboy.
DNA samples taken from the 13-year-old's schoolbag, which was found near his home after he went missing almost 30 years ago, do not match those of the 79-year-old who died in June.
Detectives are pursuing over 160 lines of inquiry since a woman told them last May that Cooke attacked Philip in October 1996 in his pirate station Radio Dublin.
They are also examining Cooke's personal possessions including documents, diaries and tapes which they received from the family and the prison service.
Gardaí are also still seeking to identify two people who may have left Philip’s schoolbag in a laneway following his disappearance on 23 October 1986 as he was on his way back to school.
She told them that around that time Cooke picked up Philip and brought him to Radio Dublin in Inchicore.
She said she saw Cooke strike Philip with an implement and that he may have killed him.
The woman said she fainted and woke up later in a car being driven by Cooke.
Aspects of the woman's statement were corroborated and detectives subsequently interviewed Cooke a number of times at a hospice in Dublin.
He confirmed he knew Philip but he died without making any admissions.
DNA samples were analysed by Forensic Science Ireland but so far no match has been found with Cooke.
Gardaí said that since the latest appeal for information last June a number of people have come forward.
They are still appealing to anyone with relevant information to contact them.
While DNA analysis has not corroborated the woman's statement, Cooke has not been ruled out as a suspect in the case.
Detectives said he could have used gloves or others could have left Philip's schoolbag in the laneway where it was discovered a week after his disappearance.
They suspect two, possibly three, people who were children at the time could have been involved in that and insist that as adults they now have nothing to fear in coming forward and should contact them.
Gardaí are also examining Cooke's personal possessions - particularly documents, diaries and tapes which they received from his family and the prison service - to identify a link to Philip or any other cases.