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An American citizen linked with the perpetrators behind the fatal Wieambilla, Australia shooting that took six lives – including two Queensland police officers – has agreed to a less severe plea deal.

Arizona-based Donald Day Jr. will face court on 21 October after finalizing the plea deal with US prosecutors.

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

Connections to Aussie Gunmen

Authorities established direct links between the defendant and the Train couple through digital communications.

The Trains, along with Nathaniel Train, murdered officers from Queensland Arnold and McCrow, and neighbour Alan Dare at a isolated location in Wieambilla, Queensland in 2022.

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

US prosecutors stated the accused communicated via online platforms with the Trains around the time of the fatal attack.

He described Queensland officers as “malignant, malformed and malevolent”, and said they should be shown “absolutely no quarter”, telling the Trains he desired to be at the scene in person.

Legal filings outlined how Gareth and Stacey Train had posted an apocalyptic video on the video platform 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

Legal records show the defendant stockpiled a cache of multiple powerful guns and hundreds of rounds of ammo at a country estate in Heber, AZ, that was equipped with a shooting range, weapons 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 plea deal submitted in court.

Day said he regularly accessed both the gun room and the weapons, and also trained others on how to use the firearms correctly.

The plea deal will result in dismissed counts that pertain to the accused issuing threats to officials and FBI agents.

According to legal files, the individual had been prohibited from owning weapons and firearms because of his history of violent crimes.

The defendant, who has served two years in custody, could receive a maximum penalty of up to 15 years imprisonment in jail or a fine of US$250,000 (A$381,500), but the agreement stipulates he will be judged under the minimum range of the legal sentencing standards.