A police investigation is continuing after a prisoner died at Hawke's Bay Regional Prison on Friday.
Custodial and medical staff provided immediate assistance, however the man was not able to be revived.
Detective senior sergeant Martin James said police had been notified of the mans death just after 5pm on Friday.
Police are investigating on behalf of the Coroner, who will determine the cause of the man's death. The Corrections Inspectorate will also carry out a review.
The Department of Corrections confirmed the death and said support is being provided to staff and prisoners.