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A US man associated with the perpetrators behind the fatal Wieambilla shooting that took six lives – including two officers from Queensland – has agreed to a less severe plea agreement.

Resident of Arizona Donald Day Jr will appear in court on October 21 after striking the plea deal with American authorities.

The individual with prior convictions, referred to online as “Geronimo's Bones”, is expected to admit guilt to a sole charge of unlawfully possessing guns and bullets in a deal to be approved by the court in the current month.

Connections to Aussie Gunmen

Investigators established direct links between Day and the Train couple through digital communications.

This couple, along with Nathaniel Train, murdered Queensland police officers Arnold and McCrow, and neighbor Alan Dare at a remote property in Wieambilla in 2022.

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

US prosecutors said Day communicated via social media with the perpetrators during the period of the deadly ambush.

Day described Queensland police as “malignant, malformed and malevolent”, and said they should be shown “no mercy whatsoever”, informing them he wanted to be at the scene physically.

Court documents detailed how the couple had posted an apocalyptic video on YouTube after the incident, stating authorities “attempted to kill us, and we retaliated”.

“Failing to stand against these evil forces makes one a coward … We will meet you at home, Don. With love,” the Trains expressed.

Firearms Cache and Legal Proceedings

Court documents show the defendant accumulated a cache of nine high-powered firearms and hundreds of rounds of ammunition at a rural property in Heber, Arizona, that was outfitted with a gun 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 plea deal filed in court.

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

The bargain will lead to dismissed counts that relate to the accused making of threats to public figures and FBI agents.

Based on court documents, the individual had been banned from possessing weapons and firearms because of his violent criminal history.

Day, who has completed two years in custody, could receive a highest sentence of up to 15 years in jail or a fine of US$250,000 (A$381,500), but the plea deal stipulates he will be judged under the minimum range of the sentencing guidelines.