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In a United States Federal Court in Arizona, Day appeared on Friday, agreeing to a plea deal made in October 2025. He admitted to the charge of possessing firearms as a convicted felon.
As part of the agreement, prosecutors dismissed earlier charges against him, which included making threats against World Health Organization officials and FBI agents, along with possessing an illegal shotgun.
The court, presided over by U.S. District Judge John Tuchi, was informed that Day had used the alias “Geronimo’s Bones” to share comments and videos on YouTube with the Train brothers between May 2021 and December 2022.
The Train brothers, Nathaniel, 46, and Gareth, 47, were involved in a deadly ambush using high-powered rifles, resulting in the deaths of Constables Matthew Arnold, 26, and Rachel McCrow, 29, at Wieambilla in December 2022.
Following the attack, Gareth Train, along with his wife Stacey, 45, and his brother, also shot and killed their neighbor, Alan Dare, 58.
Day was mentioned in the last video the Trains ever made, filmed before they were killed in a shootout with tactical officers hours after the Wieambilla ambush.
“They came to us, and we killed them,” Gareth and Stacey Train said in the video.
“We’ll see you when we go home. We’ll see you at home, Don. Love you.”
Day responded to the video saying: “those bastards will regret that they ever f***ed with us”.
Queensland Police officers had been due to testify at Day’s now aborted trial about the alleged serious danger the American’s threats posed due to his association with the Trains.
Day had prepared a sniper’s nest for a confrontation with police and told the Trains to do the same with “determination and fury”, saying he looked forward to “taking the scalps of our enemies”.
Day encountered the Train family through public comments and videos posted around a “similar, distrustful view of society”.
A Queensland inquest in November 2025 found the Trains were delusional and believed “war had reached their gates” in the form of a battle to the death with Satanic entities disguised as police.
“It was the Trains’ shared psychotic disorders, not their communications with Mr Day, that explained their actions,” Day’s lawyer, Jon Sands, told the US court.
Mr Sands called for his client to be sentenced to two years and three months with 12 months of supervised release.
Prosecutor Timothy Courchaine asked for a sentence of three years and 10 months with three years’ supervised release.
Day was sentenced to 36 months’ imprisonment minus time already served.
He had spent two years and three months in custody since his December 2023 arrest by the FBI in Arizona.
Day will be on supervised release for three years after serving at least 90 per cent of his term.
He was also ordered to forfeit his firearms and ammunition, including military-style rifles, shotguns and handguns.
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