A Perth woman is accused of assuming a murderous character she created in a novel when she killed Aaron Pajich. / 9 News
A woman accused of murdering an 18-year-old man has explained to a Perth jury that police evidence showing she researched murder and torture was for a book she was writing.
Jemma Lilley, 26, is on trial in the Supreme Court in Perth with her housemate Trudi Lenon, 43, for murdering Aaron Pajich, who had autism.
When she took the stand on Monday she went to great lengths, enthusiastically explaining to a jury her creative process for writing a planned trilogy about serial killers and the detail she went to exploring torture methods.
Jemma Lilley, 26, is on trial in the Supreme Court in Perth along with her housemate Trudi Lenon, 43, for murdering Aaron Pajich, who had autism.
She denied any knowledge of why Pajich's name and address were in a notebook she used at work and denied writing it.
Lilley is accused of having turned the murder fantasies of her writing into reality through Pajich's murder, referring to herself as the "SOS" killer character of her books, bearing a tattoo with that name and seducing Lenon into becoming a "follower".
Lilley did not know Pajich, who had studied at a Tafe with Lenon and was friends with the latter's 13-year-old son.
She had written her book Playzone nearly a decade ago when she was 16 and living in England as a high school dropout before emigrating to Australia in 2010.
She was studying a computer game design course in England and wrote the book about serial killers who tortured people as a backstory for a game.
"I was mucking around. I wanted to make it as gory as I could so they [teachers] wouldn't want to read it," she told the court.
Aaron Pajich's mother Sharon leaves court. Photo / Colin Murty, News Corp Australia
She insisted SOS (which stood for "style or smile") was a fictional character but also admitted when she was angry telling people "SOS is coming out".
"Much the same as the book's character, that represents the psychological sense of the build-up of frustration in the character," she said.
Lilley told the court the reasons there were tarpaulins hanging in her house and bin liners and black gaffer tape used to cover windows when police searched it was because she was preparing to paint an area she was using as a tattoo studio.
Matthew Stray has previously told the trial that Lilly - who was his boss at a Palmyra Woolworths supermarket - confessed to killing Pajich while stacking shelves and accurately described how he was murdered.
Pajich was found buried in the backyard of a house Lilley owned in Orelia, in Perth's south, with multiple stab wounds and a wound showing he had been garrotted.
