A depraved Aussie who stabbed her granddad — and then let him bleed to death in his kitchen as she washed the dishes — claims the TV series “American Horror Story” inspired her to kill him.

Brittany Jane Dwyer, 20, confessed to slaying her 81-year-old granddad, Robert Whitwell, at his home last August in a plot to steal his savings. At a pre-trial hearing Wednesday, her lawyer blamed his client’s sinister actions on the TV show

“That aspect of it is very troubling,” lawyer Craig Caldicott said, as he asked for leniency based on the fact that Dwyer was 19 when she committed the killing.

He continued: “The popular series explores humankind’s capacity for evil and general obsession with crime and murder.”

Adelaide Supreme Court Justice Kevin Nicholson said Dwyer’s age was the only mitigating factor in the case, which otherwise seemed callous and calculating.

Court documents released by the court Monday revealed the plot that authorities said Dwyer hatched with friend Bernadette Burns — who was waiting in a car outside the home during the slaying, the New Zealand Herald reported.

The cold-blooded killer arrived at her grandfather’s Adelaide home at 11 a.m. Aug. 5, 2016, and looked at photographs and videos of her and her brother as children with him, court documents reviewed by the outlet show.

She sent a text message to her friend saying she couldn’t go through with it, but Burns told her she had to because “they had come all this way.”

As her grandfather walked her to the front door, she pulled out a knife and stabbed him in the neck and chest.

Whitwell asked his granddaughter why she stabbed him, but she did not respond, according to the report.

The octogenarian walked to the kitchen looking for a bandage and Dwyer did the dishes as he bled out.

The two girls scoured the house for cash and found only $1,000, missing the $110,000 in savings that Whitwell had hidden in his shed.

His body was discovered three days later and the killers, who pleaded guilty to murder, will face sentencing this month.