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An American citizen associated with the perpetrators behind the deadly Wieambilla, Australia shooting that took the lives of six individuals – among them two Queensland police officers – has accepted a less severe plea deal.

Arizona-based Donald Day Jr. will appear in court on October 21 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 sole offense of unlawfully possessing firearms and ammunition in a deal to be sanctioned by the judiciary in the current month.

Links to Australian Shooters

Investigators confirmed direct links between the defendant and Gareth and Stacey Train through online posts.

This couple, along with Gareth’s brother Nathaniel, killed officers from Queensland Matthew Arnold and Rachel McCrow, and neighbour Alan Dare at a isolated location in Wieambilla in 2022.

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

American officials said Day corresponded via social media with the Trains around the time of the fatal attack.

Day described Queensland police as “evil, corrupt, and wicked”, and declared they should be shown “no mercy whatsoever”, telling them he desired to be at the scene physically.

Court documents detailed how Gareth and Stacey Train had posted an end-times video on YouTube after the incident, stating police “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 said.

Firearms Cache and Court Case

Legal records reveal Day stockpiled a collection of multiple powerful guns and hundreds of rounds of ammunition at a rural property in Heber, Arizona, that was outfitted with a shooting range, gun room and sniper’s nest.

“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 submitted in court.

Day said he regularly accessed both the gun room and the firearms, and also instructed individuals on how to operate the guns properly.

The plea deal will result in charges dropped that pertain to the alleged making of threats to officials and federal agents.

Based on legal files, the individual had been prohibited from possessing weapons and firearms because of his violent criminal history.

Day, who has served 24 months in custody, could receive a maximum penalty of up to 15 years imprisonment in jail or a penalty of US$250,000 (A$381,500), but the plea deal stipulates he will be judged under the minimum range of the legal sentencing standards.