Last week Mr Hucker pleaded guilty to the manslaughter of Kenneth James Hutchings on the basis of diminished responsibility.

Mr Hutchings was shot in the stomach during a hunting trip in March last year on a property near Condobolin.

Mason John Hucker, 27, sat quietly in the dock during the proceedings as defence barrister Charles McNamara detailed his client's time in custody during the past 12 months.

"He has been assaulted in jail," he said.

Mr McNamara also told the court his client believed the assaults had been committed by indigenous prisoners, in retaliation for the death of Mr Hutchings, who was Aboriginal.

However Justice Rod Howie said there was "no evidence" of Mr Hucker being assaulted by "Aboriginal people or gangs".

"I'm sure there are a lot of dangers in his (Mr Hucker's) mind and very few of them are based in reality," he said.

"It is an unfortunate fact of jail life that people get assaulted - it's the sort of people they meet in there."

During the trial, forensic psychiatrist Dr Hugh Jolly told the court Mr Hucker had been diagnosed as a paranoid schizophrenic, who believed he could talk to people on the television.

Yesterday, Mr Hucker's mother Rosalee Hucker gave evidence she had seen some improvement in her son's mental health since he had been in custody.

"During my last visit with him I could see an improvement - he was more able to make conversation and join in," she said.

"He was responding well, whereas before things went over his head."

Justice Howie interrupted the defence's submissions on a number of occasions and expressed his frustration with some of the evidence presented.

"This is the most unimpressive psychological evidence I've seen for a long time," he said.

"Dr Jolly says Mr Hucker's prognosis is 'uncertain' - that's helpful.

"There's no insight into his current condition - what do I do with this?"

Mr Hucker's sentencing hearing continues today and is expected to finish on Wednesday.