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A US man linked with the perpetrators behind the fatal Wieambilla, Australia attack that took six lives – among them two Queensland police officers – has accepted a watered-down plea deal.

Arizona-based Donald Day Jr. will face court on 21 October after striking the plea deal with American authorities.

The individual with prior convictions, known online as “Geronimo’s Bones”, is anticipated to admit guilt to a sole charge of unlawfully possessing firearms and ammunition in a arrangement to be sanctioned by the court in the current month.

Connections to Australian Shooters

Investigators confirmed clear connections between Day and the Train couple through online posts.

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.

They were killed in a gun battle with police, following a extended standoff at the rural site.

US prosecutors said the accused corresponded via online platforms with the Trains around the time of the fatal attack.

He referred to Queensland police as “evil, corrupt, and wicked”, and declared they should be shown “absolutely no quarter”, telling the Trains he wanted to be at Wieambilla in person.

Court documents detailed how Gareth and Stacey Train had uploaded an apocalyptic recording on the video platform after the incident, saying authorities “came to kill us and we killed them”.

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

Firearms Cache and Legal Proceedings

Legal records reveal Day accumulated a cache of multiple powerful guns and numerous bullets of ammunition at a country estate in Heber, Arizona, 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',” Day said in the agreement submitted in the legal system.

He said he frequently used both the gun room and the weapons, and also trained individuals on how to use the guns correctly.

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

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

Day, who has completed 24 months in detention, could receive a highest sentence of up to 15 years imprisonment in prison or a fine of US$250,000 (A$381,500), but the plea deal stipulates he will be judged under the low end of the sentencing guidelines.