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A US man associated with the perpetrators behind the deadly Wieambilla shooting that claimed six lives – including two officers from Queensland – has agreed to a watered-down plea deal.

Arizona-based Donald Day Jr. will face court on 21 October after striking the bargain with American authorities.

The individual with prior convictions, known online as “Geronimo’s Bones”, is anticipated to plead guilty to a single charge of illegally owning firearms and ammunition in a arrangement to be sanctioned by the court this month.

Connections to Aussie Gunmen

Investigators established clear connections between Day and Gareth and Stacey Train through digital communications.

The Trains, along with Gareth’s brother Nathaniel, murdered Queensland police officers Matthew Arnold and Rachel McCrow, and neighbour Alan Dare at a isolated location in Wieambilla, Queensland in 2022.

The Trains were killed in a gun battle with police, following a extended standoff at the regional property.

American officials said Day communicated via social media with the perpetrators during the period of the deadly ambush.

Day 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 the scene in person.

Court documents detailed how the couple had posted an apocalyptic recording on the video platform after the incident, stating authorities “came to kill us and we killed them”.

“If you don’t defend yourself against these devils and demons, you’re a coward … We will meet you at home, Don. With love,” the Trains said.

Firearms Cache and Legal Proceedings

Court documents show Day stockpiled a cache of nine high-powered firearms and hundreds of rounds of ammo at a country estate in Heber, Arizona, that was outfitted with a gun range, gun 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 submitted in court.

He said he frequently used both the weapons storage and the weapons, and also instructed others on how to use the firearms properly.

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

Based on court documents, Day had been prohibited from possessing weapons and firearms because of his violent criminal history.

Day, who has served two years in detention, faces a highest sentence of up to 15 years imprisonment in jail or a penalty of $250,000 (A$381,500), but the agreement specifies he will be sentenced under the low end of the legal sentencing standards.