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An American citizen associated with the perpetrators behind the deadly Wieambilla attack that took the lives of six individuals – among them two Queensland police officers – has agreed to a less severe plea agreement.

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

The convicted felon, referred to online as “Geronimo’s Bones”, is anticipated to admit guilt to a single charge of illegally owning guns and bullets in a deal to be approved by the judiciary in the current month.

Connections to Aussie Gunmen

Authorities confirmed clear connections between Day and Gareth and Stacey Train through digital communications.

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

The Trains were killed in a final shootout with police, following a protracted siege at the rural site.

US prosecutors said Day communicated via online platforms with the Trains around the time of the deadly ambush.

Day described Queensland officers as “evil, corrupt, and wicked”, and said they should be shown “absolutely no quarter”, informing the Trains he desired to be at Wieambilla physically.

Court documents outlined how Gareth and Stacey Train had posted an end-times video on the video platform after the incident, 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’ll see you at home, Don. Love you,” the Trains said.

Firearms Cache and Court Case

Legal records reveal Day accumulated a collection of nine high-powered firearms and hundreds of rounds of ammunition at a rural property in Heber, AZ, that was outfitted with a gun range, gun room and sniper’s nest.

“The firearms and ammunition were kept in the mobile home I shared with S.S., in a room we called the ‘gun room’,” he admitted in the plea deal filed in the legal system.

He said he regularly accessed both the weapons storage and the firearms, and also trained others on how to use the firearms properly.

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

According to court documents, the individual had been prohibited from possessing guns and arms because of his violent criminal history.

The defendant, who has served two years in custody, could receive a highest sentence of up to 15 years in prison or a penalty of US$250,000 (A$381,500), but the plea deal stipulates he will be judged under the minimum range of the legal sentencing standards.