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An American citizen linked with the culprits behind the fatal Wieambilla shooting that took six lives – including two Queensland police officers – has agreed to a less severe plea deal.

Arizona-based Donald Day Jr will appear in court on 21 October after striking the bargain with American authorities.

The individual with prior convictions, known online as “Geronimo’s Bones”, is anticipated to admit guilt to a sole offense of illegally owning firearms and ammunition in a deal to be approved by the court this month.

Links to Australian Shooters

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

This couple, along with Nathaniel Train, murdered 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 extended standoff at the regional property.

US prosecutors said the accused communicated via social media with the perpetrators around the time of the fatal attack.

Day described Queensland officers as “evil, corrupt, and wicked”, and said they should be shown “absolutely no quarter”, telling the Trains he desired to be at Wieambilla in person.

Legal filings outlined how Gareth and Stacey Train had posted an end-times recording on the video platform after the shootings, saying police “attempted to kill us, and we retaliated”.

“If you don’t defend yourself against these devils and demons, you’re a coward … We will meet you at home, Don. With love,” they said.

Weapons Stockpile and Court Case

Legal records show Day accumulated 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 hide.

“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 agreement filed in court.

He stated he regularly accessed both the gun room and the weapons, and also instructed individuals on how to operate the guns correctly.

The bargain will lead to charges dropped that pertain to the accused making of threats to officials and FBI agents.

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

The defendant, who has completed two years in detention, could receive a maximum penalty of up to 15 years imprisonment in jail or a fine of $250,000 (A$381,500), but the plea deal specifies he will be judged under the minimum range of the sentencing guidelines.