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A US man associated with the perpetrators behind the deadly Wieambilla shooting that took the lives of six individuals – including two Queensland police officers – has accepted a less severe plea deal.

Arizona-based Donald Day Jr will appear in court on 21 October after striking the plea deal with American authorities.

The individual with prior convictions, known online as “Geronimo's Bones”, is anticipated to plead guilty to a single offense of illegally owning guns and bullets in a arrangement to be sanctioned by the court in the current month.

Connections to Aussie Gunmen

Investigators established clear connections between Day and the Train couple through digital communications.

This couple, along with Nathaniel Train, murdered officers from Queensland Matthew Arnold and Rachel McCrow, and neighbour Alan Dare at a isolated location in Wieambilla, Queensland in 2022.

The Trains were fatally shot in a final shootout with law enforcement, following a protracted siege at the rural site.

US prosecutors stated the accused corresponded via social media with the Trains during the period of the fatal attack.

He referred to Queensland police as “evil, corrupt, and wicked”, and declared they should be shown “no mercy whatsoever”, telling them he wanted to be at Wieambilla physically.

Legal filings outlined how Gareth and Stacey Train had uploaded an apocalyptic recording on YouTube after the incident, stating police “attempted to kill us, and we retaliated”.

“If you don’t defend yourself against these devils and demons, you’re a coward … we’ll see you at home, Don. Love you,” they said.

Firearms Cache and Legal Proceedings

Court documents show Day accumulated a collection of nine high-powered firearms and hundreds of rounds of ammunition at a country estate in Heber, Arizona, that was outfitted with a shooting range, weapons room and sniper hide.

“The guns and ammo were stored in the trailer I occupied with S.S., within a space we named the 'gun room',” he said in the plea deal filed in court.

He stated he frequently used both the weapons storage and the firearms, and also instructed others on how to operate the firearms correctly.

The plea deal will result in charges dropped that pertain to the accused issuing threats to officials and federal agents.

According to legal files, the individual had been banned from owning weapons and firearms because of his violent criminal history.

The defendant, who has completed 24 months in detention, faces a highest sentence of up to 15 years imprisonment in prison or a penalty of US$250,000 (A$381,500), but the plea deal stipulates he will be sentenced under the low end of the sentencing guidelines.