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A US man associated with the culprits behind the fatal Wieambilla shooting that took six lives – including two Queensland police officers – has agreed to a watered-down plea deal.

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

The convicted felon, known online as “Geronimo’s Bones”, is expected to plead guilty to a sole offense of unlawfully possessing firearms and ammunition in a deal to be sanctioned by the court in the current month.

Connections to Aussie Gunmen

Authorities established direct links between Day and the Train couple through online posts.

This couple, along with Nathaniel Train, murdered Queensland police officers Arnold and McCrow, and neighbour Alan Dare at a isolated location in Wieambilla in 2022.

They were fatally shot in a gun battle with police, following a extended standoff at the regional property.

American officials stated the accused communicated via online platforms with the perpetrators during the period of the deadly ambush.

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

Court documents detailed how the couple had posted an end-times video on the video platform after the incident, stating authorities “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,” they said.

Weapons Stockpile and Legal Proceedings

Court documents reveal Day accumulated a cache of nine high-powered firearms and hundreds of rounds of ammo at a country estate in Heber, AZ, that was equipped 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 said in the plea deal filed in court.

Day stated he frequently used both the weapons storage and the firearms, and also instructed individuals on how to use the guns correctly.

The bargain will result in dismissed counts that pertain to the alleged issuing threats to officials and FBI agents.

Based on court documents, Day had been banned from owning weapons and firearms because of his history of violent crimes.

Day, who has served 24 months in custody, faces a maximum penalty of up to 15 years in jail or a penalty of $250,000 (A$381,500), but the agreement stipulates he will be sentenced under the low end of the sentencing guidelines.