A WOMAN obsessed with serial killers who was found guilty of murdering an autistic teenager has appealed her conviction, with her lawyer arguing a macabre book she wrote was “not of significant probative value”.
Jemma Lilley and her bondage-loving housemate Trudi Lenon garrotted and stabbed 18-year-old Aaron Pajich-Sweetman at their Perth house, then buried him in a shallow grave in their backyard, covering it with concrete and tiles in June 2016.
The women blamed each other at their four-and-a-half week Supreme Court of WA trial in 2017, but a jury took less than three hours to find them both guilty.
Lilley appeared in the WA Court of Appeal via video link from Eastern Goldfields Regional Prison on Wednesday.
Her defence counsel Simon Watters argued a book called Playzone, which she wrote aged 16 and centred on a fictional male serial killer named SOS, was deemed admissible at trial but not relevant as propensity evidence.
“One would think that the book was highly relevant,” one of the three appeal judges Justice Michael Buss said.
“It demonstrated the appellant’s obsession with serial killers and murder generally.”
Justice Buss noted Lilley used the name SOS in exchanges with Lenon at times close to the killing.
Mr Watters also took issue with the suggestion a person “very interested” in knives such as Lilley was more likely to have formed an intention to stab someone.
Justice Buss said the evidence, along with the rest that was heard at trial, was “overwhelmingly probative”.
Justice Robert Mazza said Lilley was “obsessed” with knives.
“There were an extraordinary number of knives,” he said.
The judges have reserved their decision.