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An American citizen associated with the culprits behind the fatal Wieambilla shooting that claimed the lives of six individuals – among them two Queensland police officers – has accepted a watered-down plea agreement.

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

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

Links to Australian Shooters

Investigators confirmed clear connections between Day and Gareth and Stacey Train through digital communications.

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

The Trains were killed in a gun battle with police, following a protracted siege at the regional property.

American officials said the accused communicated via online platforms with the perpetrators during the period of the deadly ambush.

Day referred to Queensland police as “malignant, malformed and malevolent”, and declared they should be shown “no mercy whatsoever”, informing the Trains he wanted to be at Wieambilla in person.

Legal filings detailed how the couple had posted an end-times video on YouTube after the shootings, stating police “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 said.

Weapons Stockpile and Legal Proceedings

Legal records show Day accumulated a collection of nine high-powered firearms and numerous bullets of ammo at a rural property in Heber, Arizona, that was outfitted with a shooting range, gun 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 filed in court.

He said he regularly accessed both the weapons storage and the firearms, and also instructed individuals on how to operate the firearms correctly.

The bargain will lead to charges dropped that pertain to the alleged issuing threats to public figures and FBI agents.

According to legal files, Day had been banned from possessing weapons and firearms because of his history of violent crimes.

The defendant, who has completed two years in custody, could receive a highest sentence of up to 15 years imprisonment in jail or a fine of $250,000 (A$381,500), but the agreement specifies he will be judged under the low end of the legal sentencing standards.