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An American citizen associated with the perpetrators behind the deadly Wieambilla, Australia attack that claimed the lives of six individuals – including two officers from Queensland – has agreed to a less severe plea deal.

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

The convicted felon, referred to online as “Geronimo’s Bones”, is expected to plead guilty to a single charge of unlawfully possessing guns and bullets in a deal to be approved by the judiciary this month.

Connections to Aussie Gunmen

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

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

They were killed in a gun battle with law enforcement, following a protracted siege at the rural site.

American officials said Day corresponded via online platforms with the Trains during the period of the fatal attack.

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

Legal filings detailed how the couple had uploaded an apocalyptic recording on the video platform after the shootings, stating authorities “came to kill us and we killed them”.

“If you don’t defend yourself against these devils and demons, you’re a coward … We will meet you at home, Don. With love,” the Trains expressed.

Firearms Cache and Legal Proceedings

Legal records show Day stockpiled a cache of multiple powerful guns and numerous bullets of ammo at a rural property in Heber, Arizona, 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 said in the agreement filed in the legal system.

He said he frequently used both the weapons storage and the firearms, and also trained individuals on how to operate the guns correctly.

The bargain will result in charges dropped that pertain to the accused issuing threats to public figures and FBI agents.

Based on court documents, the individual had been prohibited from owning guns and arms because of his violent criminal history.

The defendant, who has served 24 months in custody, faces a maximum penalty of up to 15 years in jail or a penalty of US$250,000 (A$381,500), but the plea deal stipulates he will be sentenced under the low end of the sentencing guidelines.