SUPERMARKET night manager Jemma Lilley murdered autistic teenager Aaron Pajich because it was on her “bucket list” to kill someone – having been helped by her “obsequious and sycophantic mate” Trudi Lenon, a prosecutor has told WA’s Supreme Court.

As the sensational trial of the two women accused of killing Mr Pajich last June draws to a close, state prosecutor James McTaggart began his closing argument – saying that there was “absolutely not the slightest doubt” of the pair’s guilt.

Over the past month, the court has heard allegations of how Ms Lilley, a young woman obsessed with knives and serial killers, and Ms Lenon – a mother-of-three with a history as a “submissive” in Perth’s BDSM scene – had built a close relationship, referring to each other by ‘pet names’.

Ms Lilley was referred to as SOS – which was also a serial killer character in a book she had written in her teens, and also the name of an American serial killer who had murdered eight victims in the mid 70s’.

Ms Lenon was known as ‘Corvina’, a name she had adopted through her participation in bondage and sado-masochistic sex.

Camera Icon Trudi Lenon has admitted she was an accessory to the attack. Credit: PerthNow

The state alleges after the two women met and moved in together, along with Ms Lenon’s younger children, they teamed up to carry out a ‘thrill kill’ on a vulnerable target.

That target, according to the state, was Mr Pajich, who was known to Ms Lenon through a shared attendance at a Kwinana college and his friendship with her teenaged son Cameron.

The 18 year-old was also on the autism spectrum, and according to Mr Taggart “still inhabited a child’s world”, including a passionate interest in computer games.

It was that interest which the state says Ms Lenon used to lure Mr Pajich to the Orelia house she shared with the 26 year-old Ms Lilley, who worked as a nightfill manager at Woolworths in Palmyra.

“Trudi Lenon delivered Aaron Pajich right into Jemma Lilley’s hands and together they murdered him,” Mr McTaggart said.

“These two ladies took Aaron Pajich’s life in a way that was as brutal and violent as could possibly be imagined.”

The motive, Mr McTaggart said, was Ms Lilley’s “life’s objective” to kill someone before she was 25 years-old, which she had revealed to a friend some years before.

“That cruel, inhumane and totally dysfunctional objective had been on her bucket list,” Mr McTaggart said.

The jury was told that after the killing, Ms Lilley had been “so full of herself, so exuberant that she had done this”, she confessed to workmate Matthew Stray.

Mr Stray gave evidence that while working together in aisle four of the Woolworth’s store days after the murder, she told him “I did it, I killed him.”

Another workmate gave evidence that in the same week, she had seen Ms Lilley with a bite mark and long, parallel scratch marks on her arm.

A post mortem revealed evidence of blood under Mr Pajich’s fingernails.

“He did claw at something, he clawed at his killer during the course of a brutal and vicious attack,” Mr McTaggart said.

Both women deny the murder, although Ms Lenon has admitted she was an accessory to the attack.

Camera Icon Jemma Lilley has denied any involvement. Credit: PerthNow

In her evidence to the trial last week, Ms Lilley claimed that Ms Lenon had brought the young man to the house to ‘train’ him in BDSM, and she had neither attacked him, killed him or buried him.

She claimed that after CCTV showed the trio entering her house, she had gone into another room and fallen asleep – waking to see Mr Pajich’s bag and belongings in her kitchen, but no sign of him.

Then she claimed Ms Lenon pressed her into renovating the back garden with a patio so her and her children had somewhere pleasant to relax, and carried out the renovations with no clue that Mr Pajich’s body was buried underneath.

She then lied to the police, she said, because Ms Lenon had asked her to.

Mr McTaggart this morning dismissed that explanation as a “pack of absolute lies” that was “incapable of being taken seriously”. The trial is due to conclude later this week.