However, she said the man reported feeling unwell the next morning. Nurses were advised to take him into Kaikohe for a check-up by a doctor, who then advised he be sent to hospital in Whangarei.
Arriving at the hospital, the man was still in pain but able to walk without assistance.
"That's where it all started to go wrong," Ms Burns said.
The Herald has been told the man was identified as having a collapsed lung, which was inflated by medical staff.
He was later found to have an infection, which led to pneumonia and eventually to his death.
Ms Burns said the man was still a prisoner at the time of his death so an inquiry would be carried out into his "death in custody".
It would be investigated from a medical perspective and by the prison's investigation inspectorate. The death had also been referred to the coroner.
She offered condolences to the family and was expecting to meet the man's parents through National MP Mark Mitchell.