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

Resident of Arizona Donald Day Jr will face court on 21 October after finalizing the bargain with American authorities.

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

Connections to Aussie Gunmen

Authorities confirmed direct links between Day 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 neighbour Alan Dare at a isolated location in Wieambilla, Queensland in 2022.

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

US prosecutors stated Day communicated via social media with the Trains around the time of the fatal attack.

Day described Queensland officers as “evil, corrupt, and wicked”, and said they should be shown “no mercy whatsoever”, informing them he desired to be at the scene in person.

Court documents outlined how Gareth and Stacey Train had posted an end-times 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’ll see you at home, Don. Love you,” the Trains expressed.

Weapons Stockpile and Court Case

Legal records reveal the defendant accumulated a cache of multiple powerful guns and hundreds of rounds of ammunition at a rural property in Heber, AZ, that was outfitted with a gun range, weapons room and sniper hide.

“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 agreement filed in the legal system.

He stated he frequently used both the weapons storage and the firearms, and also trained individuals on how to use the guns properly.

The plea deal will result in charges dropped that relate to the alleged issuing threats to officials and FBI agents.

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

Day, who has served 24 months 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 judged under the minimum range of the legal sentencing standards.