ACT leader and soon-to-be Deputy Prime Minister David Seymour sent a detailed letter to police advocating for Philip Polkinghorne during the investigation into the death of Pauline Hanna, according to new reports.

During the police investigation into the death of the Remuera eye surgeon’s wife, Seymour wrote a 1012-word letter to Auckland District Commander Karyn Malthus in April 2022.

NZ Herald political reporter Adam Pearse says Seymour accused police of acting 'inappropriately' and invading Polkinghorne's privacy.

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• ‘Let Pauline rest in peace’: Polkinghorne not guilty of murdering wife
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