ON TRIAL: Ian Robert Turnbull. Photo by James Alcock.

AS HE awaited trial for the shooting murder of an environmental officer, elderly farmer Ian Turnbull told a psychiatrist he was “resolved to spending the rest of his life in jail”.

“I can’t believe what I’ve done,” the 81-year-old told Dr Adam Martin in February, 2016, a Sydney court heard on Friday.

“I’m sorry about it now, but I’m at the end of my life.”

“I’m just about buggered.”

Turnbull shot Glen Turner with a rifle several times at his Croppa Creek property north of Moree in July, 2014 amid land-clearing disputes.

The man admits killing Mr Turner but is fighting a charge of murder on the basis thathe “snapped” and lost self-control.

His Supreme Court murder trial has previously heard from a psychiatrist who claims Turnbull was suffering from major depression and wasn’t thinking rationally when he shot the 51-year-old environmental officer.

But during yesterday’s testimony, Dr Martin said it was unlikely Turnbull, who had increased his workload leading up to the shooting, would have been able to function if he suffered from a type of major depression.

He said an adjustment disorder could cause him to overreact to stressors, but doubted whether such a condition would have a significant impact on his functioning.

“He obviously understood what he had done was … wrong in the eyes of the law,” the psychiatrist said after being quizzed on evidence Turnbull went home andwaited for police after the shooting.

And the fact Turnbull did not also shoot Turner’s colleague, who allegedly pleaded with the gunman to put down his rifle, showed he had “some ability at least to make positive actions around his behaviour,” Dr Martin said.

On Thursday, treating forensic psychiatrist Professor David Greenberg told the court that his client was not thinking rationally when he shot Mr Turner.

“In his perception, he saw the world in dark-tintedglasses,” he said.

“He had a major depression, and it’s not a temporary or transient thing.”

Professor Greenberg rejected crown prosecutor Pat Barrett’s claims, saying he wasn’tsatisfied the shooting waspremeditated.

“He only developed the intention to shoot Mr Turnbull when he drove up to the laneway,” he said.

Professor Greenberg said Turnbull did not try and present himself as mentally ill, but

the brief of evidence he had collected on the farmer said otherwise.

He said Turnbull had a family history of mental illness and had been prescribed anti-depressants by his doctor after an episode in the 1970s.

His delusions on his situation were apparent, Professor Greenberg said.

“In his mind, he perceived he was ruined … he was bankrupt … that everything was over,” he said.

The trial continues before Justice Peter Johnson.

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