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An American citizen associated with the perpetrators behind the fatal Wieambilla, Australia shooting that took the lives of six individuals – including two officers from Queensland – has agreed to a less severe plea agreement.

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

The individual with prior convictions, known online as “Geronimo’s Bones”, is expected to plead guilty to a single offense of illegally owning firearms and ammunition in a arrangement to be approved by the judiciary in the current month.

Connections to Australian Shooters

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

This couple, 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 gun battle with police, following a protracted siege at the rural site.

US prosecutors said the accused corresponded via social media with the perpetrators during the period of the deadly ambush.

Day described Queensland police as “malignant, malformed and malevolent”, and declared they should be shown “absolutely no quarter”, informing them he wanted to be at Wieambilla physically.

Legal filings outlined how Gareth and Stacey Train had posted an end-times video 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,” they said.

Firearms Cache and Court Case

Legal records reveal Day stockpiled a cache of multiple powerful guns and hundreds of rounds of ammo at a rural property in Heber, AZ, that was outfitted 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',” Day admitted in the agreement submitted in court.

He stated he regularly accessed both the gun room and the firearms, and also trained individuals on how to use the guns correctly.

The bargain will lead to dismissed counts that relate to the alleged issuing threats to public figures and federal agents.

Based on legal files, the individual had been prohibited from owning 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 in prison or a fine of $250,000 (A$381,500), but the agreement stipulates he will be judged under the minimum range of the sentencing guidelines.