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A US man linked with the culprits behind the fatal Wieambilla, Australia attack that took six lives – including two officers from Queensland – has accepted a less severe plea deal.

Arizona-based Donald Day Jr will face court on October 21 after striking the bargain with US prosecutors.

The convicted felon, known online as “Geronimo's Bones”, is expected to plead guilty to a single offense of unlawfully possessing guns and bullets in a deal to be sanctioned by the judiciary this month.

Connections to Australian Shooters

Authorities established clear connections between the defendant and Gareth and Stacey Train through online posts.

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

They were fatally shot in a final shootout with law enforcement, following a extended standoff at the rural site.

American officials stated the accused corresponded via social media with the perpetrators around the time of the fatal attack.

He described Queensland police as “malignant, malformed and malevolent”, and declared they should be shown “absolutely no quarter”, informing the Trains he desired to be at Wieambilla physically.

Legal filings detailed how Gareth and Stacey Train had uploaded an end-times video 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’ll see you at home, Don. Love you,” they expressed.

Firearms Cache and Court Case

Court documents show the defendant stockpiled a cache of multiple powerful guns and hundreds of rounds of ammo at a country estate in Heber, Arizona, that was equipped 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 said in the agreement submitted in court.

Day said he frequently used both the gun room and the weapons, and also instructed individuals on how to use the guns correctly.

The plea deal will lead to charges dropped that relate to the accused making of threats to public figures and FBI agents.

According to legal files, the individual had been prohibited from owning guns and arms because of his history of violent crimes.

Day, who has completed two years 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 sentenced under the minimum range of the legal sentencing standards.