Defense attorneys argued that Jessica Camilleri was mentally ill, which contributed to her losing control. Jurors were also told that Jessica Camilleri was fascinated by horror films such as “The Texas Chainsaw Massacre” and “Jeepers Creepers.”

Jessica Camilleri’s sister, Kristy Torrisi, told jurors that when they would watch dismemberment scenes in horror movies, Jessica would pause and rewind to see the scene again, the Herald reports.

Jessica Camilleri was also known to grab people’s hair and rip it out at the root, according to the newspaper.

David Greenberg, a forensic psychiatrist, testified that Jessica Camilleri understood she was killing her mother, but that her ability to control herself was “substantially impaired” because of her mental illnesses.

Jessica Camilleri told investigators she launched into a “fit of rage, of panic” when her mother attempted to procure professional help for her daughter, according to the newspaper.

In an initial interview with police, Jessica Camilleri claimed she was defending herself from her mother, but she later acknowledged that the idea of decapitation came from watching horror films.“I remember stabbing my mum. I wouldn’t stop,” Camilleri told the forensic psychiatrist, according to the Herald. “I injured myself. I was getting her everywhere.”

In a police body camera recording, Jessica Camilleri can be heard asking a police officer whether doctors could “resew” her mother’s head back on, according to news.com.au.