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A US man associated with the culprits behind the deadly Wieambilla attack that claimed the lives of six individuals – including two Queensland police officers – has accepted a watered-down plea deal.

Resident of Arizona Donald Day Jr will appear in court on 21 October after finalizing the bargain with US prosecutors.

The convicted felon, known online as “Geronimo’s Bones”, is anticipated to admit guilt to a sole offense of unlawfully possessing guns and bullets in a arrangement to be sanctioned by the judiciary in the current month.

Connections to Aussie Gunmen

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

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

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

US prosecutors said Day corresponded via online platforms with the Trains during the period of the fatal attack.

He referred to Queensland police as “malignant, malformed and malevolent”, and said they should be shown “absolutely no quarter”, informing them he desired to be at the scene physically.

Legal filings outlined how the couple had uploaded an end-times video on the video platform after the shootings, stating police “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,” they expressed.

Weapons Stockpile and Legal Proceedings

Court documents show the defendant accumulated a cache of multiple powerful guns and numerous bullets of ammunition at a rural property in Heber, Arizona, that was outfitted with a gun range, gun room and sniper’s nest.

“The guns and ammo were stored in the trailer I occupied with S.S., within a space we named the 'gun room',” Day said in the agreement submitted in the legal system.

Day said he frequently used both the weapons storage and the firearms, and also trained others on how to operate the firearms properly.

The plea deal will result in dismissed counts that relate to the alleged making of threats to public figures and federal agents.

According to court documents, Day had been prohibited from possessing weapons and firearms because of his history of violent crimes.

The defendant, who has completed 24 months in detention, could receive a maximum penalty of up to 15 years imprisonment in jail or a penalty of US$250,000 (A$381,500), but the agreement specifies he will be judged under the low end of the legal sentencing standards.