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An American citizen associated with the perpetrators behind the fatal Wieambilla shooting that claimed the lives of six individuals – including two officers from Queensland – has accepted a watered-down plea deal.

Resident of Arizona Donald Day Jr will face court on October 21 after striking the bargain with US prosecutors.

The individual with prior convictions, referred to online as “Geronimo's Bones”, is expected to plead guilty to a single offense of unlawfully possessing guns and bullets in a arrangement to be sanctioned by the court this month.

Connections to Aussie Gunmen

Authorities established clear connections between Day and the Train couple through online posts.

The Trains, 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 fatally shot in a gun battle with law enforcement, following a protracted siege at the rural site.

American officials stated Day corresponded via social media with the perpetrators during the period of the fatal attack.

Day referred to Queensland police as “evil, corrupt, and wicked”, and said they should be shown “no mercy whatsoever”, informing them he wanted to be at Wieambilla physically.

Legal filings detailed 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”.

“Failing to stand against these evil forces makes one a coward … we’ll see you at home, Don. Love you,” they expressed.

Firearms Cache and Legal Proceedings

Court documents show Day accumulated a cache of multiple powerful guns and numerous bullets 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’,” Day said in the plea deal filed in court.

He said he regularly accessed both the weapons storage and the firearms, and also instructed individuals on how to operate the guns correctly.

The bargain will lead to dismissed counts that pertain to the accused issuing threats to public figures and FBI agents.

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

Day, who has served two years in detention, faces a highest sentence of up to 15 years in prison or a fine of $250,000 (A$381,500), but the agreement stipulates he will be sentenced under the low end of the sentencing guidelines.