SYDNEY, Dec 18 AAP - A young man who murdered Inspector Bryson Anderson with a hunting knife following a protracted siege at his mother's property has been sentenced to at least 26 years in prison.
Mitchell Barbieri, who escaped the mandatory life sentence reserved for cop killers, broke down as he was sentenced to a maximum 35 years at the Supreme Court on Thursday.
His mother Fiona, meanwhile was sentenced to a minimum of seven years and six months for the manslaughter of the officer and various other offences.
Inspector Bryson Anderson's wife, brothers and parents, along with other close family and friends filled the upper gallery of the Supreme Court in Darlinghurst for the pair's sentencing.
Downstairs, his uniformed colleagues from his local area command packed the seats to hear about the final moments of their much-loved mate.
In handing down his sentence, Justice Robert Hulme began by paying tribute to the "loyal, caring, humble, ethical, honest ... good man".
Insp Anderson had visited the Barbieri's rural Oakville property in Sydney's northwest on December 6, 2012, after reports Mitchell had been shooting arrows at his neighbour.
Following a protracted siege, Mitchell lunged toward Insp Anderson.
"He plunged a hunting knife deep into the officer's chest causing virtually immediate death," Justice Hulme said.
On the day their trial was due to start this year, Mitchell pleaded guilty to murder while his mother Fiona, 46, pleaded guilty to manslaughter on the basis of substantial impairment.
Fiona sat expressionless as Justice Hulme recounted how she was once a senior executive at American Express, but by about 2008 had experienced late-onset paranoid schizophrenia.
She became increasingly paranoid she was being persecuted by police and political leaders, and her life began to fall apart.
By the time of Insp Anderson's death, Mitchell had taken on his mother's delusions.
Since being in prison, he was unable to understand what he had been thinking and was "heartbroken", the court heard.
But Justice Hulme said although the Barbieris regretted what had happened, he was not persuaded either was genuinely remorseful because they had not accepted responsibility.