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An American citizen associated with the culprits behind the fatal Wieambilla attack that took the lives of six individuals – among them two Queensland police officers – has accepted a less severe plea agreement.

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

The convicted felon, known online as “Geronimo's Bones”, is anticipated to admit guilt to a sole offense of illegally owning guns and bullets in a deal to be approved by the judiciary this month.

Connections to Aussie Gunmen

Investigators established direct links between Day and Gareth and Stacey Train through online posts.

The Trains, along with Nathaniel Train, killed officers from Queensland Arnold and McCrow, and neighbor Alan Dare at a remote property in Wieambilla in 2022.

They were killed in a final shootout with police, following a extended standoff at the rural site.

American officials stated the accused communicated via social media with the perpetrators during the period of the fatal attack.

He described Queensland officers as “malignant, malformed and malevolent”, and said they should be shown “absolutely no quarter”, telling them he wanted to be at Wieambilla in person.

Court documents outlined how the couple had posted an apocalyptic video on the video platform after the shootings, stating police “attempted to kill us, and we retaliated”.

“Failing to stand against these evil forces makes one a coward … we’ll see you at home, Don. Love you,” the Trains expressed.

Weapons Stockpile and Court Case

Legal records reveal the defendant accumulated a cache of nine high-powered firearms and numerous bullets of ammunition at a country estate in Heber, AZ, that was outfitted with a shooting range, gun 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’,” Day admitted in the plea deal filed in court.

Day said he frequently used both the weapons storage and the weapons, and also instructed others on how to operate the guns correctly.

The bargain will result in charges dropped that pertain to the alleged making of threats to public figures and FBI agents.

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

The defendant, who has completed 24 months in detention, could receive a maximum penalty of up to 15 years in jail or a penalty of US$250,000 (A$381,500), but the plea deal stipulates he will be sentenced under the minimum range of the legal sentencing standards.