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Sydney GP awaits his murder trial verdict

AAP logoAAP 10/11/2016 Margaret Scheikowski

The marriage of a Sydney doctor accused of murdering his wife was unhappy but not so toxic as to drive him to want to kill her, a judge has been told.

Both Kenneth and Christine Crickitt had been married and divorced in the past, they had no religious reason stopping them from splitting and had no children together, said his lawyer Lisa-Claire Hutchinson.

She was continuing the defence's final submissions on Thursday at Crickitt's judge-alone trial in the NSW Supreme Court.

The 63-year-old GP has pleaded not guilty to murdering his 58-year-old wife by injecting her with a lethal dose of fast-acting insulin on New Year's Eve or New Year's Day in 2010.

A pathologist could not determine the cause of death.

The crown says the GP's motivation included him being fed up with his marriage, besotted with his new lover and keen to avoid a costly and embarrassing divorce.

But Ms Hutchinson noted the lover Linda Livermore testified that marriage was only "a feasible possibility" sometime down the track.

"There is no evidence in this trial of any pending intersection between the deceased and Ms Livermore to impel him to kill," she said.

The crown says answers given by Crickitt to police in his interview on the day of his wife's death showed he was unable "to hide his utter disdain and contempt" for her.

But Ms Hutchinson said it was improbable that "someone in the position of the accused, if he had killed his wife, would provide police with the very motive".

A killer would be expected to conceal or understate his difficulties and troubles with his wife, she added.

The judge had described Crickitt's behaviour after his wife's death as quite bizarre and showing "an extraordinary level of insensitivity".

Crickitt's senior barrister, Tim Gartelmann SC, referred to the GP's internet search relating to intentional overdoses of insulin involving 25 cases and two deaths.

"The article did not contain information of how long insulin remains detectable in the blood," he said.

"It was not in the nature of an article on how to kill with insulin and get away with it."

Justice Clifton Hoeben, who continued Crickitt's bail, said he expected to deliver his verdict before the end of the year.

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