Philip Polkinghorne's defence team says the Crown's accusations against him have been an insult.

The Auckland eye surgeon is accused of killing his wife, Pauline Hanna, in 2021.

In his closing remarks Ron Mansfield KC says a lack of injuries on Hanna's body must mean she took her own life.

Herald reporter George Block says Mansfield also gave an explanation for Polkinghorne deleting his messages with sex worker Madison Ashton.

"Mansfield says that was just because he didn't want that to become public - if it was going to be this big investigation, he didn't want his extramarital liaisons to become public fodder."

Ron Mansfield will continue his remarks in the morning before the judge sums up the case, then the jury's expected to start deliberating tomorrow afternoon.

LISTEN ABOVE

• Jury in Polkinghorne murder trial expected to begin deciding verdict tomorrow
• 'No innocent explanation': Crown paints Polkinghorne as manipulative, arrogant killer
• After seven weeks and 80 witnesses, evidence concludes in Polkinghorne murder trial
• Polkinghorne murder trial live: Most suicides don't leave notes - defence
• Polkinghorne trial: 'Vicious circle' of sleep deprivation may have upped suicide risk, expert says
• Did Pauline Hanna use phone at 4am before death? Duelling IT experts face off
• Deja vu for jurors at Polkinghorne murder trial as familiar faces return to witness box