Sydney GP sentenced to 27 years' jail for murdering wife

Sydney GP Brian Kenneth Crickitt has been sentenced to a maximum of 27 years in jail for the murder of his wife Christine on New Year's Eve, 2009.

The 2016 trial, heard by a judge alone, was told 63-year-old Crickitt killed his wife with a lethal injection of insulin so he could claim her life insurance and start a new life with his lover.

There were no traces of insulin found in Ms Crickitt's body, but there was other evidence that led to his conviction.

Crickitt had viewed webpages outlining the dose required for a lethal injection of insulin the day before he killed Christine.

Evidence presented during the trial also revealed that he had tried to hide his internet search history.

The following day, he wrote a prescription for fast-acting insulin under another patient's name, and filled it himself at a Campbelltown pharmacy.

After he injected his wife, he left her to 'die a painful death alone', according to Justice Clifton Hoeben.

The Judge also revealed that Crickitt showed callous conduct in the days following his wife's death, such as openly displaying affection to then-lover Linda Livermore.

Ms Livermore told police that Crickitt came to her in the early hours of New Year's Day.

"I cuddled him on my bed, which sounds really awful, but we just talked all night", she told police.

Crickitt was sentenced to 27 years, with a non-parole period of 20 years and three months.