A string of inquiries is under way into how a healthy 25-year-old inmate died after a five-hour journey between prisons.
The inmate's life support was turned off about 3pm on Thursday after his family watched his life slip away over the fortnight that passed since he suffered a collapsed lung.
Corrections regional commissioner Jeanette Burns said two internal investigations were under way to understand how the prisoner had become unwell.
She said he was transferred by van from Mt Eden Prison to Northland Prison near Kaikohe on May 29.
The man was checked by nurses on arrival - part of a normal prison transfer routine.