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An American citizen associated with the culprits behind the deadly Wieambilla, Australia attack that took the lives of six individuals – including two officers from Queensland – has agreed to a less severe plea agreement.

Resident of Arizona Donald Day Jr will face court on 21 October after finalizing the plea deal with American authorities.

The individual with prior convictions, known online as “Geronimo's Bones”, is anticipated to plead guilty to a single charge of illegally owning guns and bullets in a deal to be approved by the court in the current month.

Connections to Aussie Gunmen

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

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

The Trains were fatally shot in a gun battle with police, following a extended standoff at the rural site.

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

He described Queensland police as “evil, corrupt, and wicked”, and said they should be shown “absolutely no quarter”, informing them he wanted to be at the scene in person.

Court documents outlined how Gareth and Stacey Train had uploaded an end-times video on the video platform after the incident, stating authorities “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 said.

Firearms Cache and Court Case

Court documents reveal Day accumulated 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, gun room and sniper’s nest.

“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 plea deal filed in the legal system.

He said he frequently used both the weapons storage and the weapons, and also instructed others on how to use the guns properly.

The plea deal 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 prohibited from owning guns and arms 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 jail or a fine of US$250,000 (A$381,500), but the plea deal specifies he will be judged under the low end of the legal sentencing standards.