The estranged husband of triple murderer Erin Patterson is set to release an explosive tell-all memoir about life with his former wife.

Simon Patterson, whose parents Don and Gail were killed at the infamous beef wellington lunch in July 2023, is set to release the book later this year.

Simon's aunt Heather Wilkinson also died after Patterson served them a beef wellington meal that was laced with lethal death cap mushrooms. 

His uncle Ian Wilkinson fell seriously ill after the meal but survived.

The book will feature Simon's experiences with the mushroom cook including the allegations that Patterson tried to poison him on multiple occasions such as with a penne bolognese, chicken korma and a vegetable curry wrap.

Those allegations were unable to be heard during Patterson's murder trial after Justice Christopher Beale ruled they must be heard by a different jury, the prosecution later dropping the three attempted murder charges. 

Details of the publisher who scored the book's rights remain unclear, the Herald Sun reported.

During pre-trial hearings last year, Simon told the Supreme Court that he may tell his story in a major interview, book or show.

'I think there are quite a few reasons why that would be a good idea,' he said.

'The local community is grieving because of what happened and a lot of people are keen to know what happened.

'I think informing them of what happened would help for their grief.'

Simon asked Justice Beale for the transcripts of all legal proceedings to help him through the grieving process.

It is not yet clear whether Simon will make reference to those transcripts within the highly anticipated book.

The memoir, which does not yet have a public title, has been spearheaded by Simon's spokesperson and friend, Jessica O'Donnell.

The pair worked together at land developer Landgipps from 2020 to 2022.

It comes as Patterson, 51, seeks to appeal her murder convictions, claiming there were six 'substantial' miscarriages of justice during her trial and a 'fundamental irregularity' with the jury.

Patterson was found guilty of three counts of murder and one count of attempted murder in July last year.

She was sentenced to life imprisonment with a non-parole period of 33 years.

The prosecution have also launched its own appeal, calling for Patterson to be re-sentenced to life without parole.

During sentencing, Justice Beale noted Patterson's offending was the worst category of murder and represented a betrayal of trust towards people she considered family.

But he showed Patterson mercy with the chance of parole, noting she was essentially in solitary confinement for at least 22 hours a day.

Acting Director of Public Prosecutions Diana Piekusis KC said the judge had erred by finding there was a 'substantial chance' Patterson would be held in solitary confinement for years.

Justice Beale accepted there was no proven motive, but he found Patterson concocted an elaborate story to cover up her offending, including lying about a food dehydrator and having cancer.