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A US man associated with the culprits behind the fatal Wieambilla attack that took the lives of six individuals – among them two officers from Queensland – has accepted a watered-down plea agreement.

Resident of Arizona Donald Day Jr will face court on 21 October after finalizing the plea deal with American authorities.

The individual with prior convictions, referred to online as “Geronimo's Bones”, is anticipated to plead guilty to a single offense of unlawfully possessing firearms and ammunition in a arrangement to be approved by the judiciary this month.

Connections to Aussie Gunmen

Authorities confirmed clear connections between the defendant and the Train couple through online posts.

This couple, along with Nathaniel Train, killed officers from Queensland Matthew Arnold and Rachel McCrow, and neighbor Alan Dare at a remote property in Wieambilla in 2022.

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

American officials stated the accused corresponded via online platforms with the perpetrators around the time of the fatal attack.

He described Queensland police as “malignant, malformed and malevolent”, and said they should be shown “no mercy whatsoever”, informing the Trains he wanted to be at Wieambilla physically.

Court documents outlined how the couple had posted an apocalyptic 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’ll see you at home, Don. Love you,” the Trains said.

Firearms Cache and Court Case

Legal records show Day accumulated a collection of nine high-powered firearms and hundreds of rounds of ammo at a rural property in Heber, AZ, that was equipped with a shooting 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',” he said in the plea deal filed in court.

He stated he regularly accessed both the weapons storage and the weapons, and also instructed individuals on how to operate the guns properly.

The bargain will lead to charges dropped that relate to the accused making of threats to public figures and federal agents.

According to legal files, the individual had been prohibited from owning guns and arms because of his violent criminal history.

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