Child killer Folbigg’s new legal fight

Kathleen Folbigg has launched a legal bid for another review of her case after the last one cemented her guilt over the deaths of her four children.

Folbigg's legal team fronted the NSW Supreme Court on Thursday to announce they would challenge the finding of Honorable Reginald Blanch, AM QC, who concluded that he had no reasonable doubt as to the serial child killer's guilt.

The former NSW District Court Chief Judge's inquiry, this year, found the 51-year-old did kill her children Caleb, Patrick, Sarah and Laura.

But Folbigg's lawyers want that result overturned so she can pursue further appeals.

At present she is currently serving a 30-year sentence and will not be eligible for parole until 2028.

The court, on Thursday, heard the matter may have NSW Attorney-General Mark Speakman join Mr Blanch as a respondent.

Mr Speakman announced the inquiry in 2018 after Folbigg's lawyers lodged a petition casting doubt on some of the evidence that led to her conviction.

At the time he said he had wrestled with the idea given the trauma and pain it would cause the killer's ex-husband, Craig Folbigg, who lost his children.

The focal point of the inquiry became Folbigg's disturbing diaries where she wrote she had done "terrible things" and one of her children had passed "with a bit of help".

The diaries were key pieces of evidence in her 2003 trial.

Mr Blanch, at the time, dismissed her claims the entries were taken out of context.

"I find the answers given by Ms Folbigg … in which she gave explanations as to the meaning of various diary entries, to be simply unbelievable," he wrote.

"I am satisfied the diary entries were written by a reasonably intelligent woman in plain language, carrying their plain meaning."

The matter will return to court on November 14.