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A US man associated with the culprits behind the fatal Wieambilla, Australia attack that claimed six lives – among them two Queensland police officers – has agreed to a less severe plea agreement.

Arizona-based Donald Day Jr will face court on October 21 after finalizing the plea deal with US prosecutors.

The convicted felon, referred to online as “Geronimo's Bones”, is expected to plead guilty to a single offense of unlawfully possessing firearms and ammunition in a arrangement to be approved by the court in the current month.

Connections to Aussie Gunmen

Investigators confirmed clear connections between the defendant and Gareth and Stacey Train through digital communications.

The Trains, along with Gareth’s brother Nathaniel, killed Queensland police officers Arnold and McCrow, and neighbour Alan Dare at a remote property in Wieambilla in 2022.

The Trains were fatally shot in a final shootout with police, following a protracted siege at the regional property.

US prosecutors said Day communicated via social media with the perpetrators around the time of the deadly ambush.

Day referred to Queensland officers as “evil, corrupt, and wicked”, and declared they should be shown “absolutely no quarter”, telling the Trains he wanted to be at Wieambilla physically.

Court documents outlined how the couple had uploaded an apocalyptic recording on YouTube after the shootings, stating authorities “attempted to kill us, and we retaliated”.

“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

Legal records show Day stockpiled a cache of multiple powerful guns and hundreds of rounds of ammunition at a rural property in Heber, AZ, that was outfitted with a shooting 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',” Day said in the plea deal filed in the legal system.

Day said he regularly accessed both the gun room and the firearms, and also trained individuals on how to operate the guns correctly.

The plea deal will lead to dismissed counts that pertain to the alleged issuing threats to public figures and FBI agents.

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

Day, who has completed 24 months in custody, 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 stipulates he will be sentenced under the low end of the sentencing guidelines.