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A US man linked with the perpetrators behind the fatal Wieambilla shooting that claimed the lives of six individuals – including two officers from Queensland – has accepted a watered-down plea deal.

Arizona-based Donald Day Jr will appear in court on 21 October after finalizing the plea deal with US prosecutors.

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

Connections to Aussie Gunmen

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

The Trains, along with Nathaniel Train, killed officers from Queensland Matthew Arnold and Rachel McCrow, and neighbour 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 Trains during the period of the fatal attack.

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

Legal filings outlined how Gareth and Stacey Train had posted an apocalyptic video on YouTube after the incident, saying police “came to kill us and we killed them”.

“If you don’t defend yourself against these devils and demons, you’re a coward … we’ll see you at home, Don. Love you,” the Trains expressed.

Weapons Stockpile and Court Case

Court documents show the defendant accumulated a collection of multiple powerful guns and numerous bullets of ammo at a country estate in Heber, AZ, that was outfitted with a gun range, weapons 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 admitted in the plea deal submitted in the legal system.

He said he frequently used both the weapons storage and the firearms, and also trained individuals on how to operate the firearms correctly.

The plea deal will lead to charges dropped that pertain to the accused making of threats to public figures and FBI agents.

According to court documents, Day had been prohibited from owning guns and arms because of his history of violent crimes.

Day, who has served 24 months in detention, faces a maximum penalty of up to 15 years in prison or a fine of $250,000 (A$381,500), but the plea deal specifies he will be sentenced under the minimum range of the sentencing guidelines.