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A US man linked with the perpetrators behind the deadly Wieambilla, Australia attack that took the lives of six individuals – including two officers from Queensland – has accepted a watered-down plea agreement.

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

The convicted felon, known online as “Geronimo’s Bones”, is anticipated to admit guilt to a sole charge of unlawfully possessing guns and bullets in a arrangement to be sanctioned by the court this month.

Connections to Australian Shooters

Authorities established clear connections between the defendant and the Train couple through online posts.

This couple, along with Gareth’s brother Nathaniel, killed 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 final shootout with law enforcement, following a protracted siege at the rural site.

American officials stated the accused corresponded via online platforms with the perpetrators during the period of the fatal attack.

Day described Queensland officers as “malignant, malformed and malevolent”, and declared they should be shown “no mercy whatsoever”, informing the Trains he wanted to be at Wieambilla in person.

Court documents outlined how the couple had posted an apocalyptic recording on the video platform 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,” they said.

Weapons Stockpile and Court Case

Legal records show the defendant stockpiled a cache of multiple powerful guns and hundreds of rounds of ammo at a rural property in Heber, Arizona, that was equipped with a shooting 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 agreement submitted in court.

He said he regularly accessed both the weapons storage and the firearms, and also trained others on how to use the firearms correctly.

The bargain will lead to dismissed counts that relate to the accused issuing threats to public figures and federal agents.

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

Day, who has completed two years in detention, faces a maximum penalty of up to 15 years imprisonment in jail or a penalty of US$250,000 (A$381,500), but the agreement specifies he will be sentenced under the minimum range of the sentencing guidelines.