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An American citizen associated with the culprits behind the deadly Wieambilla shooting that took six lives – among them two officers from Queensland – has accepted a less severe plea agreement.

Resident of Arizona Donald Day Jr. will face 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 admit guilt to a single offense of unlawfully possessing firearms and ammunition in a deal to be sanctioned by the judiciary in the current month.

Connections to Australian Shooters

Investigators established clear connections between the defendant and the Train couple through online posts.

This couple, along with Gareth’s brother Nathaniel, murdered Queensland police officers Matthew Arnold and Rachel McCrow, and neighbor Alan Dare at a isolated location in Wieambilla in 2022.

The Trains were fatally shot in a final shootout with law enforcement, following a extended standoff at the regional property.

American officials said Day corresponded via social media with the perpetrators during the period of the deadly ambush.

He described 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 physically.

Court documents detailed how Gareth and Stacey Train had uploaded an end-times recording on the video platform after the incident, saying police “came to kill us and we killed them”.

“Failing to stand against these evil forces makes one a coward … We will meet you at home, Don. With love,” they said.

Firearms Cache and Court Case

Court documents show the defendant stockpiled a collection of multiple powerful guns and hundreds of rounds of ammunition at a country estate in Heber, Arizona, that was equipped with a shooting range, weapons 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 said in the agreement submitted in court.

Day said he regularly accessed both the gun room and the firearms, and also instructed individuals on how to use the firearms properly.

The bargain will result in dismissed counts that relate to the accused making of threats to public figures and FBI agents.

According to court documents, Day had been prohibited from possessing guns and arms because of his violent criminal history.

Day, who has completed 24 months in detention, faces a highest sentence of up to 15 years imprisonment in prison or a penalty of $250,000 (A$381,500), but the agreement stipulates he will be sentenced under the low end of the sentencing guidelines.