An elderly Australian woman who stabbed her ailing husband with a kitchen knife in a nursing home said she couldn't stand seeing him suffer.

Anastasia Nestorowycz, 76, stabbed her 82-year-old husband in the stomach then stabbed herself in the bathroom of his nursing home unit in Thornbury, Victoria.

The Supreme Court was told Monday that Nestorowycz, of Thornbury, stabbed her husband Paul Nestorowycz — who suffered dementia, diabetes and used a wheelchair — once in the stomach, then stabbed herself in the stomach and cut her wrist on June 14 last year.

She pleaded guilty yesterday to attempting to murder her husband of 35 years.

The couple were found covered in blood by nursing home staff and taken with serious injuries to the hospital.

The court was told Nestorowycz walked every day to the nursing home to see her sick husband, taking him food, clothing and spending time with him.

But in the weeks before the stabbing, Nestorowycz, who had been seeking treatment for depression, had become paranoid her husband was being mistreated, the court was told.

Prosecutor Chris Ryan SC said police had found two notes from Nestorowycz begging for forgiveness.

A note found in her husband's nursing home room read: "Forgive me for the sin, wrongdoing, infraction. I am very tired."

Another read: "Everything is bad. Whatever I have done I have done it because of tiredness."

Family friend Pamela Manikas told the court Nestorowycz had exhausted herself looking after her husband and their 32-year-old son.

Justice David Harper will sentence Nestorowycz next week.

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