Erin Patterson, the Australian woman imprisoned for life for the mushroom murders, has submitted a legal challenge challenging the guilty verdicts.
The 51-year-old was convicted of murdering three relatives and trying to kill another with a toxic mushroom meal at her house in Victoria state in that year.
Under Australian law, appeals do not happen automatically, and her defense lawyers had to convince the higher court that there could have been judicial mistakes in her trial.
Patterson's appeal was officially lodged on Monday, following the court granting her legal representatives approval to challenge the convictions.
The reasons behind the challenge are still unknown.
Over the course of the lengthy trial, Patterson consistently declared her innocence, claiming that the incident was a tragic mistake, and she had not intentionally included toxic mushrooms in the prepared lunch she made and presented for dinner.
Her in-laws Don and Gail Patterson, each seventy years old, and the sister Heather Wilkinson, in her mid-sixties, succumbed after consuming the dish.
The spouse Wilkinson, a religious leader, pulled through following recovery from a comatose state, and still has ongoing medical problems connected to the mushroom incident.
Once seven days of consideration passed, the twelve-member jury announced their collective finding - guilty on all charges.
She was sentenced to a record-long jail terms handed down to a woman convict in the nation - life in prison, with no opportunity for parole for at least 33 years.
That signifies Patterson would be in her elderly years when she might request release.
Currently she possesses the opportunity to dispute the jury's conviction.
The four-week period to lodge an appeal expired on 6 October, however an updated legal provision, allowing lawyers more time without having to provide reasons, allowed her attorneys additional time to file the documents.
There was intense public interest in the poisonous fungus incident, and a media frenzy swirled around the modest courthouse in the country town of that location during the trial.
Throughout two months of witness accounts, the court received testimony implying Patterson had gathered toxic fungi in local communities and enticed those affected to the lethal dinner with deceptive claims that she had cancer - prior to attempting to hide her actions by providing false statements and eliminating traces.
Her former partner, Patterson, was also asked to the meal but backed out recently, to some extent because he felt that she had been attempting to harm him over a long period.
Subsequent to the verdict, information emerged that he had grown extremely sick post ingestion of multiple dishes she prepared previously that he had been in a coma, much of his digestive tract required surgical extraction, and relatives were informed to prepare for his passing twice as he was not expected to survive.
Patterson resides in a all-female penitentiary - that particular institution in the city.
At the time of her sentencing, the judicial officer told the court she remains for most hours daily in her prison room, with no communication with other detainees due to her "major offender status".
The judge noted that her public image and the huge media and public interest in the incident meant she would likely "continue being an infamous inmate going forward, and, therefore, stay vulnerable from other prisoners".
Wildlife biologist specializing in sloth research with over a decade of field experience in Central and South America.