Police are appealing to the public for information following the suspicious death of a man in December last year.

David Davan, aged 67, from Herekino died in Auckland Hospital on December 9 after falling ill in November.

His death was initially treated as unexplained, however, as a result of further enquiries it's been established that Mr Davan was poisoned prior to his death and a homicide investigation has been launched.

"A police investigation has determined that he was poisoned after consuming a quantity of wine from two wine bottles which had been left in his letterbox, with an examination revealing poison in one of the bottles," says a police spokesperson.

"Further forensic testing of these bottles is currently underway.

"Police believe that these bottles were likely placed in David Davan's letterbox on Puhata Road sometime in early November 2021 and are appealing for help from the local community to identify those who are responsible."

Anyone who has any information which may assist our investigation is asked to call Police on 105, quoting file number 211114/9270, or you can speak to an officer in person by visiting the Kaitaia Police station.

Information can also be provided anonymously by calling Crime Stoppers on 0800 555 111