Nirmeen Noufl was due to stand trial in the NSW Supreme Court after pleading not guilty to murdering her husband in May 2023.
But the trial was delayed at the last moment and, on Wednesday, the 55-year-old pleaded guilty to manslaughter of 62-year-old Mamdouh Noufl.
She had a blank expression, sitting in a custody cell which beamed into the courtroom before pleading not guilty to murdering her husband.
"I plead guilty to manslaughter in the alternative," Noufl told the court.
Agreed facts are expected to be released to media later on Wednesday, once certain redactions have been made.
Noufl was arrested in October 2024 and charged with murdering her husband at their home in western Sydney more than a year earlier.
Noufl was accused of intentionally killing her husband during a physical altercation before dismembering his body with kitchen knives and an electric drop saw.
Prosecutors alleged she then placed his remains in up to 30 rubbish bags, which she disposed of in residential and industrial bins in suburbs around western Sydney.
Mr Noufl's remains have never been recovered.
Noufl pleaded guilty to the lesser charge of manslaughter, which does not require intent to cause death or grievous bodily harm.
She will return to court for a sentencing hearing in September.
According to court documents tendered during an earlier attempt by Noufl to be granted bail, the couple had a fraught marriage punctuated by domestic abuse.
The documents state Mr Noufl had become engaged to another woman in Egypt in late 2022 and had informed his wife that he wanted to continue that relationship while also remaining married to her.
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