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

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

The individual with prior convictions, referred to online as “Geronimo’s Bones”, is expected to plead guilty to a sole charge of unlawfully possessing firearms and ammunition in a deal to be approved by the judiciary in the current month.

Links to Aussie Gunmen

Authorities confirmed clear connections between the defendant and the Train couple through digital communications.

This couple, along with Nathaniel Train, 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 final shootout with police, following a extended standoff at the rural site.

American officials said the accused communicated via social media with the Trains during the period of the fatal attack.

He described Queensland officers as “evil, corrupt, and wicked”, and declared they should be shown “absolutely no quarter”, telling them he desired to be at Wieambilla physically.

Court documents outlined how the couple had posted an apocalyptic video on the video platform after the shootings, saying authorities “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.

Firearms Cache and Court Case

Court documents reveal the defendant stockpiled a cache of multiple powerful guns and hundreds of rounds of ammunition at a rural property in Heber, Arizona, that was equipped with a shooting range, gun 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 filed in the legal system.

He said he frequently used both the weapons storage and the firearms, and also trained individuals on how to use the guns correctly.

The bargain will result in dismissed counts that relate to the alleged issuing threats to public figures and FBI agents.

Based on court documents, Day had been banned from possessing weapons and firearms because of his history of violent crimes.

The defendant, who has served two years in custody, could receive a maximum penalty of up to 15 years imprisonment in prison or a penalty of US$250,000 (A$381,500), but the plea deal specifies he will be sentenced under the low end of the sentencing guidelines.