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An American citizen associated with the perpetrators behind the deadly Wieambilla attack that took the lives of six individuals – among them two officers from Queensland – has agreed to a watered-down plea deal.

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

The individual with prior convictions, known online as “Geronimo’s Bones”, is expected to admit guilt to a single charge of unlawfully possessing firearms and ammunition in a deal to be approved by the judiciary this month.

Connections to Australian Shooters

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

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

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

American officials said Day communicated via online platforms with the perpetrators around the time of the fatal attack.

He described Queensland officers as “malignant, malformed and malevolent”, and said they should be shown “no mercy whatsoever”, telling the Trains he desired to be at the scene physically.

Court documents detailed how the couple had posted an apocalyptic recording on YouTube after the incident, 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’ll see you at home, Don. Love you,” the Trains expressed.

Firearms Cache and Court Case

Court documents show Day accumulated a cache of nine high-powered firearms and hundreds of rounds of ammo at a rural property in Heber, Arizona, that was outfitted with a gun range, weapons 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’,” Day admitted in the plea deal submitted in court.

Day stated he regularly accessed both the gun room and the weapons, and also trained individuals on how to operate the firearms properly.

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

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

Day, who has served two years in custody, could receive a highest sentence of up to 15 years in prison or a penalty of $250,000 (A$381,500), but the plea deal stipulates he will be sentenced under the low end of the legal sentencing standards.