KATHLEEN Folbigg has lost a final avenue of appeal against her convictions for killing her four babies at Singleton between 1989 and 1999.
Evidence at an inquiry announced after a Hunter campaign from 2013 "reinforces Ms Folbigg's guilt" said former NSW District Court Chief Judge and inquiry chair Reg Blanch.
He found Folbigg's explanations about incriminating diary entries at the times of the babies' deaths "simply unbelievable".
"The attempts by Ms Folbigg to explain away the diary entries as saying one sentence did not follow from another sentence, and that they were just "random thoughts", cannot be accepted," Mr Blanch said.
He found Folbigg was untruthful to police in an interview before the 2003 trial and he did not accept her evidence at the inquiry that she did not have any concerns about her diary entries.
A diary entry in which she hopes a diary "doesn't come back to bite me like my 97 one has" showed she "understood very well the danger her diaries presented to her".
"I find that Ms Folbigg's untruthfulness to the police and in the evidence she gave before the Inquiry was a deliberate attempt to obscure the fact that she committed the offences of which she was convicted.
"None of the extensive non-medical evidence before me, including Ms Folbigg's evidence, causes me to interpret the diary entries other than in accordance with the ordinary English meaning of the words which she wrote.
"Rather than supporting any existence of a reasonable doubt of her guilt, I am satisfied that the plain meaning interpretation of the diary entries carries the character contended by the Crown at the trial of virtual admissions of guilt for the deaths of Caleb, Patrick and Sarah and admissions that she appreciated she was at risk of causing similarly the death of Laura."
Mr Blanch concluded that "the investigations of the Inquiry have instead produced evidence that reinforces Ms Folbigg's guilt".
"I find Ms Folbigg's evidence and the listening device transcripts, neither of which were before the jury, when considered in light of her interview with police, show that Ms Folbigg has been in many respects untruthful, unbelievable and made deliberate attempts to obscure the fact that she committed the offences of which she was convicted," he said.
NSW Attorney-General Mark Speakman issued a statement from London saying he had spoken to Folbigg's former husband Craig Folbigg about the report's findings.
"I acknowledge that the decision to commence an inquiry has further aggravated what already was an unimaginable tragedy," Mr Speakman said.
"I am sorry for the toll that the inquiry has taken on Mr Folbigg and family members over the last year. I hope that the conclusion of the inquiry, and the report's findings, might provide comfort in some way to the relatives of Caleb, Patrick, Sarah and Laura, and will dispel community concern regarding Ms Folbigg's convictions."
An emotional Kathleen Folbigg, 52, wept as she spoke on the phone to friend and long-time supporter Tracy Chapman at 6.30pm from the governor's office of Silverwater Women's Correction Centre where she waited to hear the decision.
"She was just waiting in the office with the guards and she was as nervous as hell," Ms Chapman said.
"We were just both crying and I was so worried about the decision and her."
In a six-minute phone call at 2.30pm today Folbigg was "calm but hopeful" that "surely, surely the decision would go her way", Ms Chapman said.
The decision came just days after an internationally recognised authority on genetically-linked heart conditions told the inquiry an "exceptional" genetic variant in Kathleen Folbigg and the two daughters she was jailed for killing "justifies fully re-opening" the case against her.
Folbigg, 52, was jailed for at least 25 years in 2003 after she was found guilty of killing her four babies, Caleb, Patrick, Sarah and Laura, at Singleton between 1989 and 1999.
The Folbigg inquiry was ordered by Attorney General Mark Speakman in August after a University of Newcastle Legal Centre team petitioned the NSW Governor for the inquiry in 2015 following a two-year investigation of the Folbigg case.
The investigation focused on the lack of evidence the babies were suffocated and the incidence of three or more baby deaths in the one family from unidentified natural causes.
The university team launched the investigation after Hunter woman Helen Cummings made an emotional appeal to the then NSW Attorney-General Greg Smith in 2013, saying the case against Folbigg had "all the hallmarks of another Lindy Chamberlain", who was wrongly convicted and jailed for killing daughter Azaria at Uluru.
Mr Speakman said the decision to hold an inquiry had been "immensely difficult" and was "something that has weighed on me heavily".
"The worst thing that can happen to anyone in their life is to lose a child. Just imagine what it must be like to lose four children. It has weighed on me. Whatever view you take of this case it is a tragedy beyond imagining that four beautiful children were lost," he said in August after announcing the inquiry.