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

Arizona-based Donald Day Jr. will appear in court on October 21 after finalizing the plea deal with US prosecutors.

The convicted felon, known online as “Geronimo's Bones”, is anticipated to admit guilt to a single charge of unlawfully possessing guns and bullets in a arrangement to be sanctioned by the court this month.

Connections to Aussie Gunmen

Investigators confirmed direct links between the defendant and the Train couple through digital communications.

The Trains, along with Gareth’s brother Nathaniel, killed officers from Queensland Arnold and McCrow, and neighbour Alan Dare at a isolated location in Wieambilla in 2022.

They were fatally shot in a final shootout with police, following a protracted siege at the regional property.

US prosecutors said the accused communicated via online platforms with the perpetrators during the period of the deadly ambush.

Day referred to Queensland officers as “evil, corrupt, and wicked”, and said they should be shown “absolutely no quarter”, informing the Trains he desired to be at Wieambilla physically.

Legal filings outlined how Gareth and Stacey Train had posted an apocalyptic recording on the video platform after the incident, 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 expressed.

Weapons Stockpile and Legal Proceedings

Court documents reveal Day accumulated a collection of multiple powerful guns and numerous bullets of ammo at a rural property in Heber, AZ, that was outfitted 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',” Day said in the agreement submitted in the legal system.

He said he regularly accessed both the weapons storage and the weapons, and also trained individuals on how to operate the guns correctly.

The plea deal will result in dismissed counts that relate to the accused making of threats to public figures and federal agents.

Based on legal files, the individual had been prohibited from owning 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 legal sentencing standards.