Serial-killer obsessed Brit woman vowed to kill someone before she turned 25 before knife rampage on autistic teen while backpacking in Australia

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A BRITISH killer who slaughtered an autistic teen in Australia as part of her twisted “bucket list” had vowed to murder someone before she turned 25.

Jemma Lilley, 26, strangled and stabbed 18-year-old Aaron Pajich – Sweetman to death at her macabre home in Perth before burying his body underneath tile slabs in the back garden.

British killer Lilley, pictured, strangled and stabbed Pajich to death
British killer Jemma Lilley garrotted her victim with a wire until it broke
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But prior to committing this heinous crime, Lilley, then just 23, had told how her urge to kill was “getting stronger and stronger”.

Lilley – and accomplice Trudi Lenon – were found guilty of Aaron’s murder in November – and now Seven’s Sunday Night has explored what drove Lilley to kill.

Speaking on last night’s programme was the manager of Lilley’s local video shop, Angela McKibbin, who revealed how the killer would divulge her twisted fantasies.

Angela told Sunday Night: “She (Lilley) told me that she wanted to kill someone and that the feeling that she had was getting stronger and stronger.

“She didn’t know if she could control it for much longer. And that she wanted to kill someone before she was 25.”

Lilley enlisted Lenon, a mum-of-three whom she lived with in Perth. The pair were understood to have been in a relationship.

Lily's accomplice Trudi Lenon lured the teen, pictured, to the house
Autistic teen Aaron Pajich was lured to the house thinking he was coming to fix a computer
Accomplice Lenon, pictured, is beileved to have been in a relationship with Jemma Lilley
Accomplice Trudi Lenon is believed to have been in a relationship with Lilley
News Corp Australia

Lenon then introduced Lilley to Aaron, her son’s friend who lived on the same street.

In June, 2016, Lilley sent a chilling text to bondage-loving Lenon, admitting: “I feel as though I cannot rest until the blood or flesh of a screaming victim is gushing out and pooling on the floor, until all the roads and streets are stained red.”

Lenon replied: “It is definitely time – I am ready, you are ready.”

Later that month, the pair killed the teenager, with Lenon agreeing to help her pal commit her first murder as her “submissive”.

The Orelia home where Aaron Pajich was decorated with horror memorabilia including this "Chucky" doll
The home where Aaron Pajich was killed was decorated with horror memorabilia including this Chucky doll
News Corp Australia
Detectives also found a pot containing what appeared to be meat dissolving in acid
Detectives also found a pot containing what appeared to be meat dissolving in acid
News Corp Australia
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This ‘secret’ room covered in blue tarp is where Aaron’s killers are believed to have kept the body before burying him
News Corp Australia

After dropping her kids at school on June 13, 2016, Lenon lured Aaron to the home by asking him to install some computer software.