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A US man associated with the perpetrators behind the fatal Wieambilla, Australia attack that took the lives of six individuals – including two Queensland police officers – has agreed to a less severe plea agreement.

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

The individual with prior convictions, referred to online as “Geronimo's Bones”, is expected to admit guilt to a sole offense of unlawfully possessing firearms and ammunition in a arrangement to be sanctioned by the judiciary this month.

Links to Aussie Gunmen

Investigators established direct links between Day and Gareth and Stacey Train through digital communications.

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

The Trains were killed in a gun battle with law enforcement, following a extended standoff at the rural site.

US prosecutors said the accused corresponded via social media with the Trains around the time of the fatal attack.

He referred to Queensland officers as “malignant, malformed and malevolent”, and said they should be shown “no mercy whatsoever”, telling the Trains he desired to be at Wieambilla in person.

Court documents outlined how the couple had posted an end-times recording on YouTube after the shootings, stating 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.

Weapons Stockpile and Legal Proceedings

Court documents show the defendant accumulated a cache of nine high-powered firearms and numerous bullets of ammo at a country estate in Heber, Arizona, that was outfitted with a shooting range, weapons 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 said in the plea deal submitted in court.

Day stated he regularly accessed both the gun room and the weapons, and also instructed others on how to use the guns correctly.

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

According to legal files, Day had been banned from possessing weapons and firearms because of his history of violent crimes.

Day, who has served two years in custody, faces a maximum penalty 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.