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

Arizona-based Donald Day Jr. will face court on 21 October after finalizing the bargain with American authorities.

The individual with prior convictions, referred to online as “Geronimo's Bones”, is anticipated to admit guilt to a single charge of illegally owning guns and bullets in a arrangement to be approved by the judiciary 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 Arnold and McCrow, and neighbour Alan Dare at a remote property in Wieambilla in 2022.

The Trains were killed in a final shootout with police, following a protracted siege at the regional property.

American officials stated Day corresponded via social media with the perpetrators during the period of the deadly ambush.

He described Queensland officers as “malignant, malformed and malevolent”, and declared they should be shown “absolutely no quarter”, informing the Trains he wanted to be at the scene physically.

Court documents outlined how Gareth and Stacey Train had posted an apocalyptic recording on the video platform after the incident, stating authorities “attempted to kill us, and we retaliated”.

“If you don’t defend yourself against these devils and demons, you’re a coward … We will meet you at home, Don. With love,” the Trains expressed.

Weapons Stockpile and Court Case

Court documents show the defendant accumulated a collection of nine high-powered firearms and hundreds of rounds of ammo at a country estate in Heber, AZ, that was outfitted 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 filed in the legal system.

Day stated he regularly accessed both the weapons storage and the weapons, and also instructed others on how to operate the guns properly.

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

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

Day, who has completed two years in custody, faces a highest sentence of up to 15 years imprisonment in jail or a penalty of $250,000 (A$381,500), but the plea deal stipulates he will be sentenced under the low end of the sentencing guidelines.