The pathologist who did Pauline Hanna's autopsy has taken the stand in Phillip Polkinghorne's murder trial.

The Auckland eye doctor is accused of killing his wife, Hanna, in 2021 - although his defence claims she killed herself.

The court's heard today from Doctor Kilak Kesha.

ZB's Chelsea Daniels says Kesha detailed seeing a belt impression on Hanna's neck at the scene.

"An officer there alerted him to a belt found - he said it looked identical, but pretty much immediately after, defence lawyer Ron Mansfield got Kesha to concede the belt could have been used in her death."

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