The daughter of a woman murdered by her Sydney GP husband has recalled the killer going into callous detail about the dissection of her mother's brain as family members grieved.
Brian Kenneth Crickitt, 63, was last year convicted of murdering his second wife Christine Crickitt, 58, with a lethal injection of fast-acting insulin to the buttock either late on New Year's Eve 2009 or early New Year's Day 2010.
In a statement read to the NSW Supreme Court, Ms Crickitt's daughter, Tracey Wiggins, said she had been confronted to meet her stepfather's mistress on the day she found out about her mother's death.
The mistress also drove the dead woman's car to the morgue and Crickitt talked in detail about how the brain may be treated until he was asked to stop, the court heard.
"It was heartless," Ms Wiggins said in a statement read by her husband during a sentence hearing on Friday.
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"The deception and the betrayal (by her stepfather) is incredibly debilitating."
The Crown had submitted Crickitt killed his second wife after becoming fed up with his marriage and besotted with his new lover, Linda Livermore, who was allegedly seen holding hands with the murderer near the morgue.
Ms Wiggins said she had at times felt guilty about the murder, because she knew the marriage was troubled and that her mother was worried by Crickitt's strange behaviour.
She would at times weep so much that she could only whisper, "it hurts so much", the court heard.
"What a waste of life," she said in the statement.
"What a deplorable...waste of my lovely mother's life."
Crickitt, who has since married a third wife, Julie, has never shown any remorse for the crime.
His defence barrister Tim Gartelmann SC said there was evidence the doctor had suffered mental health problems for decades and may have a tougher time than most in jail due to his age.
Crown prosecutor Mark Tedeschi SC said the crime constituted a serious betrayal of trust because Crickitt was not only his wife's partner but also her treating GP.
He said Crickitt would have known his wife would die relatively slowly and that he killed her around New Year's because he knew the autopsy would be delayed.
Despite the seriousness of the crime, the Crown did not submit Crickitt deserved the maximum penalty of life imprisonment.
Ms Wiggins says she has chosen to forgive Crickitt and to grow stronger.
"I don't want to be a victim anymore," she said.
Crickitt is due to be sentenced on May 5.
