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A US man linked with the perpetrators behind the fatal Wieambilla shooting that took the lives of six individuals – including two Queensland police officers – has agreed to a watered-down plea agreement.

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

The individual with prior convictions, referred to online as “Geronimo’s Bones”, is expected to plead guilty to a sole offense of unlawfully possessing firearms and ammunition in a deal to be sanctioned by the court this month.

Links to Aussie Gunmen

Authorities confirmed clear connections between Day and Gareth and Stacey Train through online posts.

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

The Trains were killed in a final shootout with police, following a extended standoff at the rural site.

American officials said the accused communicated via online platforms with the perpetrators during the period of the fatal attack.

He described Queensland officers as “malignant, malformed and malevolent”, and declared they should be shown “no mercy whatsoever”, informing them he desired to be at Wieambilla in person.

Legal filings outlined how the couple 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’ll see you at home, Don. Love you,” the Trains expressed.

Firearms Cache and Court Case

Legal records reveal Day stockpiled a cache of multiple powerful guns and hundreds of rounds of ammo at a country estate in Heber, AZ, that was equipped with a shooting range, gun 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 said in the plea deal filed in court.

Day said he frequently used both the weapons storage and the firearms, and also trained others on how to use the firearms properly.

The bargain will result in dismissed counts that pertain to the accused issuing threats to public figures and federal agents.

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

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