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An American citizen associated with the perpetrators behind the deadly Wieambilla shooting that took six lives – including two officers from Queensland – has agreed to a less severe plea deal.

Arizona-based Donald Day Jr. will appear in court on 21 October after striking the plea deal with US prosecutors.

The convicted felon, known online as “Geronimo's Bones”, is expected to admit guilt to a single offense of unlawfully possessing firearms and ammunition in a deal to be sanctioned by the court this month.

Connections to Australian Shooters

Investigators established clear connections between the defendant and Gareth and Stacey Train through digital communications.

The Trains, along with Nathaniel Train, killed officers from Queensland Arnold and McCrow, and neighbour Alan Dare at a remote property in Wieambilla in 2022.

The Trains were killed in a final shootout with police, following a extended standoff 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 officers as “evil, corrupt, and wicked”, and declared they should be shown “no mercy whatsoever”, telling them he wanted to be at Wieambilla physically.

Legal filings detailed 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’ll see you at home, Don. Love you,” the Trains said.

Firearms Cache and Legal Proceedings

Legal records reveal the defendant stockpiled a cache of nine high-powered firearms and numerous bullets of ammunition at a rural property in Heber, Arizona, that was equipped with a shooting range, weapons 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',” he admitted in the agreement submitted in the legal system.

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

The bargain will result in charges dropped that relate to the alleged making of threats to officials and federal agents.

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

The defendant, who has served 24 months in detention, could receive a maximum penalty of up to 15 years in jail or a fine of $250,000 (A$381,500), but the agreement specifies he will be sentenced under the low end of the legal sentencing standards.