Boxer Danny Green has wished an “obscenely painful death” on one of the women who murdered teenager Aaron Pajich-Sweetman after she was attacked in prison this week.

In a post to his 588,000 Facebook followers, the outspoken Perth sportsman said the law had been forced “into the hands of the community” when Trudi Lenon was badly burnt by a fellow inmate at Bandyup Women’s Prison.

Lenon, 43, was doused with boiling water during a suspected payback attack on New Year’s Day.

“My hat is off to whoever carried out this act,” Green wrote.

“I’m tired of our putrid constitution forcing the law into the hands of the community.

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“This poor young man. The way his life ended was just incomprehensible.

“I hope you get an infection and die a horrid and slow and obscenely painful death you foul mutt.”

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His Facebook rant has been liked by more than 3500 people, including Aaron Pajich’s stepmother Veronica Desmond.

“Thank you for your support Danny. I’m Aaron’s Mum and life is very difficult now much more than it was,” she wrote.

In a separate post Ms Desmond said, “Thankyou. We need to be tough and push through it all Aaron lives on through his father Keith Sweetman and I. Rest in Peace Aaron.”

Camera Icon Aaron Pajich-Sweetman’s stepmother Veronica Desmond. Credit: The West Australian

Mr Pajich-Sweetman’s aunt Trinity Sweetman was more explicit, “Need to be tortured every single day what u done to my nephew ..Rip Azza.” (sic)

And, in an apparent reference to the amount of burns Lenon allegedly received in the attack, Ms Sweetman said “ Should be 99.9 per cent next.”

Comments on Green’s post have been overwhelmingly positive, with many calling on him to stand for parliament.

Some, though, have pointed out that the message appears at odds with his anti-violence campaign.

Green has been a vocal campaigner against one-punch violence and coined the term “coward’s punch” for the attacks.

“The Coward Punch can also be construed by the coward as “vigilante justice”. Even though nobody feels bad when these mutts get their natural street justice, you need to be aware of potential pit falls in your logic Danny,” one Facebook user wrote.

Camera Icon Killers: Jemma Lilley and Trudi Lenon. Credit: SundayPubs

“While I agree with 99.9 % of what you say Danny - But Remember what ghandi said ‘ an eye for an eye makes the whole world blind,” another wrote.

Green, who is unavailable for comment, said he was writing “what many think.”

Lenon and her partner-in-crime Jemma Lilley, 26, lured autistic 18-year-old Mr Pajich-Sweetman to their Orelia home in June 2016 and killed him to satisfy a twisted death fetish.

Both were convicted in November of murder after a long trial and are due to be sentenced next month for the crime.