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An American citizen linked with the perpetrators behind the deadly Wieambilla attack that took the lives of six individuals – including two officers from Queensland – has accepted a watered-down plea agreement.

Arizona-based Donald Day Jr. will appear in court on 21 October after striking the plea deal 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 deal to be approved by the court this month.

Connections to Aussie Gunmen

Authorities confirmed direct links between the defendant and the Train couple through online posts.

The Trains, along with Gareth’s brother Nathaniel, killed Queensland police officers Matthew Arnold and Rachel McCrow, and neighbor Alan Dare at a isolated location in Wieambilla in 2022.

They were killed in a final shootout with law enforcement, following a protracted siege at the regional property.

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

Day referred to Queensland police as “evil, corrupt, and wicked”, and declared they should be shown “absolutely no quarter”, informing them he desired to be at Wieambilla in person.

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

“Failing to stand against these evil forces makes one a coward … We will meet you at home, Don. With love,” the Trains expressed.

Weapons Stockpile and Legal Proceedings

Court documents show the defendant accumulated a collection of nine high-powered firearms and numerous bullets of ammo at a rural property in Heber, AZ, that was outfitted 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 admitted in the agreement submitted in court.

Day stated he regularly accessed both the weapons storage and the firearms, and also instructed individuals on how to use the firearms properly.

The bargain will lead to dismissed counts that relate to the accused making of threats to public figures and FBI agents.

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

The defendant, who has completed 24 months in custody, could receive a highest sentence of up to 15 years in jail or a penalty of US$250,000 (A$381,500), but the plea deal specifies he will be sentenced under the minimum range of the sentencing guidelines.