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A US man associated with the perpetrators behind the deadly Wieambilla, Australia attack that claimed the lives of six individuals – among them two Queensland police officers – has accepted a watered-down plea deal.

Arizona-based Donald Day Jr will appear in court on October 21 after striking the bargain with American authorities.

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

Connections to Australian Shooters

Authorities confirmed direct links between the defendant and the Train couple through online posts.

The Trains, 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 gun battle with law enforcement, following a extended standoff at the rural site.

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

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

Court documents detailed how Gareth and Stacey Train had uploaded an end-times recording on the video platform after the incident, stating authorities “came to kill us and we killed them”.

“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

Legal records reveal Day stockpiled a cache of multiple powerful guns and numerous bullets of ammunition at a country estate in Heber, Arizona, that was outfitted with a gun range, gun room and sniper hide.

“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 gun room and the weapons, and also trained others on how to use the firearms properly.

The plea deal will result in dismissed counts that relate to the alleged issuing threats to public figures and federal agents.

Based on legal files, Day had been banned from owning weapons and firearms because of his violent criminal history.

Day, who has served 24 months in detention, faces a maximum penalty of up to 15 years in prison or a penalty of US$250,000 (A$381,500), but the agreement specifies he will be judged under the low end of the sentencing guidelines.