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A US man linked with the perpetrators behind the fatal Wieambilla, Australia attack that claimed six lives – including two officers from Queensland – has accepted a less severe plea agreement.

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

The individual with prior convictions, known online as “Geronimo’s Bones”, is expected to plead guilty to a single charge of illegally owning firearms and ammunition in a arrangement to be sanctioned by the judiciary in the current month.

Links to Aussie Gunmen

Authorities established 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 neighbour Alan Dare at a remote property in Wieambilla, Queensland in 2022.

They were fatally shot in a gun battle with police, following a protracted siege at the regional property.

American officials stated Day corresponded via social media with the perpetrators around the time of the deadly ambush.

Day referred to Queensland officers as “evil, corrupt, and wicked”, and declared they should be shown “no mercy whatsoever”, telling the Trains he wanted to be at Wieambilla physically.

Legal filings detailed how the couple had uploaded an apocalyptic video on YouTube after the shootings, stating authorities “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.

Firearms Cache and Court Case

Court documents show the defendant stockpiled a collection of nine high-powered firearms and numerous bullets of ammunition at a country estate in Heber, Arizona, that was outfitted with a gun range, gun room and sniper hide.

“The guns and ammo were stored in the trailer I occupied with S.S., within a space we named the 'gun room',” Day admitted in the agreement filed in the legal system.

Day stated he frequently used both the gun room and the weapons, and also instructed others on how to operate the firearms properly.

The bargain will lead to charges dropped that pertain to the alleged issuing threats to officials and FBI agents.

According to legal files, the individual had been prohibited from possessing guns and arms because of his history of violent crimes.

Day, who has served two years 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 judged under the minimum range of the legal sentencing standards.