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A US man linked with the perpetrators behind the fatal Wieambilla, Australia attack that took six lives – among them two officers from Queensland – has accepted a watered-down plea agreement.

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

The individual with prior convictions, referred to online as “Geronimo’s Bones”, is anticipated to admit guilt to a single offense of unlawfully possessing firearms and ammunition in a arrangement to be sanctioned by the court this month.

Links to Aussie Gunmen

Authorities established clear connections between Day and Gareth and Stacey Train through digital communications.

The Trains, along with Gareth’s brother Nathaniel, killed Queensland police officers 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 regional property.

American officials said the accused corresponded via social media with the perpetrators during the period of the fatal attack.

He referred to Queensland police as “evil, corrupt, and wicked”, and declared they should be shown “no mercy whatsoever”, telling the Trains he desired to be at Wieambilla physically.

Court documents outlined how the couple had posted an apocalyptic video on YouTube after the shootings, 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 said.

Firearms Cache and Legal Proceedings

Legal records show the defendant accumulated a collection of multiple powerful guns and numerous bullets of ammunition at a rural property in Heber, AZ, that was outfitted with a gun range, weapons room and sniper hide.

“The firearms and ammunition were kept in the mobile home I shared with S.S., in a room we called the ‘gun room’,” he admitted in the agreement submitted in the legal system.

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

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

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

The defendant, who has completed 24 months in custody, faces a highest sentence of up to 15 years in jail or a fine of US$250,000 (A$381,500), but the plea deal specifies he will be judged under the minimum range of the sentencing guidelines.