A Queensland coroner says the three extremists behind the Wieambilla terror attack, which claimed the lives of two young police officers and a neighbour, had a "shared delusional disorder".

It has been almost three years since Constable Matthew Arnold, Constable Rachel McCrow and Alan Dare were shot dead.

On December 12, 2022, the police officers were ambushed by Gareth, Nathaniel and Stacey Train while responding to a missing persons report.

Coroner Terry Ryan is currently handing down his long-awaited findings into the deadly ambush.

Mr Ryan said Gareth, Stacey and Nathaniel each had an "undiagnosed and untreated psychotic illness".

A mammoth five-week long inquest was held last year into the attack, which occurred on a rural block near Tara, about 300 kilometres west of Brisbane.

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