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GP's murder trial told of buttock mark

AAP logoAAP 1/11/2016 Margaret Scheikowski

The murder trial of a Sydney doctor has been told a mark inside a bruise on his wife's buttock could have been an injection site.

But forensic pathologist Dr Rebecca Irvine also said it could have been an abrasion, which was one reason why she could not "absolutely state it is a puncture mark".

Brian Kenneth Crickitt, 63, has pleaded not guilty in the NSW Supreme Court to murdering Christine Crickitt, 58, by injecting her with a lethal dose of fast-acting insulin late on New Year's Eve or early on New Year's Day in 2010.

The crown alleges their relationship had become toxic leading to Crickitt murdering his wife so he could claim her life insurance worth $568,000 and be with his new lover.

An autopsy carried out by Dr Irvine on January 2, 2010, was unable to ascertain any cause of death.

Fast-acting insulin is not detectable in the blood after 24 hours.

Giving evidence on Tuesday, Dr Irvine said that in December 2010 police came to see her with photos of the bruise on Ms Crickitt's buttock.

They asked whether a mark within the bruise could represent an injection site and she agreed it could.

"At the time of the autopsy did you appreciate the significance of this bruise and red mark which might be an injection site?" asked prosecutor Mark Tedeschi QC.

She replied she did not, adding if she had she would probably would have taken a biopsy of the area to see if it was a track due to an injection.

Mr Tedeschi has alleged that Crickitt deliberately chose New Year's Eve to murder his wife knowing it was highly unlikely an autopsy would be held on New Year's Day.

Under cross-examination from Crickitt's lawyer, Tim Gartelmann SC, Dr Irvine said autopsies were usually carried out "as soon as practicable, the next day".

"The next day could be a weekend, public holiday or otherwise?," he asked.

"That is my recollection," Dr Irvine replied.

She agreed that she knew police had deemed the death as suspicious and that at the time of the autopsy she had not considered the buttock mark to be an injection site.

The trial is continuing.

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