A Sydney jury has begun deliberating its verdict over a horror film fan's decapitation of her mother.
Jessica Camilleri, 27, stabbed her mother Rita at least 100 times after an argument before taking her mother's head from the kitchen of their St Clair home and placing it on a footpath outside.
She pleaded not guilty to murder in the NSW Supreme Court, using a partial defence of substantial impairment by abnormality of the mind due to a loss of control.
Two forensic psychiatrists have told the trial the woman was suffering from a substantial impairment of the mind at the time of the frenzied knife attack in July 2019.
Both diagnosed her with an intellectual disability and autism spectrum disorder that features a fixation on horror films, though only one attributed the loss of control to the mixture of those conditions.
The other expert said an intermittent explosive disorder had a significant role to play.
After a week-long trial, the jury began deliberating about 12.30pm on Tuesday.
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