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A US man linked with the perpetrators behind the deadly Wieambilla shooting that claimed six lives – among them two Queensland police officers – has accepted a watered-down plea agreement.

Resident of Arizona Donald Day Jr. will face court on 21 October after striking the plea deal with US prosecutors.

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

Connections to Aussie Gunmen

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

This couple, along with Gareth’s brother Nathaniel, murdered Queensland police officers Matthew Arnold and Rachel McCrow, and neighbor Alan Dare at a remote property in Wieambilla in 2022.

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

American officials stated the accused corresponded via online platforms with the Trains during the period of the deadly ambush.

Day described Queensland police as “evil, corrupt, and wicked”, and declared they should be shown “no mercy whatsoever”, informing the Trains he wanted to be at the scene physically.

Legal filings outlined how Gareth and Stacey Train had posted an apocalyptic video on YouTube after the incident, stating 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 will meet you at home, Don. With love,” they said.

Weapons Stockpile and Court Case

Legal records reveal Day stockpiled a collection of nine high-powered firearms and hundreds of rounds of ammo at a rural property in Heber, Arizona, that was equipped with a gun range, weapons 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 said in the agreement submitted in court.

Day stated he regularly accessed both the gun room and the firearms, and also instructed others on how to operate the guns properly.

The plea deal will lead to charges dropped that pertain to the alleged making of threats to officials and federal agents.

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

The defendant, who has completed 24 months in custody, could receive a maximum penalty of up to 15 years imprisonment in prison or a penalty of US$250,000 (A$381,500), but the plea deal specifies he will be sentenced under the low end of the legal sentencing standards.