The inmate who died at Hawkes Bay Prison on Friday was Kolby Heta.
Police and the Department of Corrections are investigating the death of the 30-year-old.
It is understood Heta, from Gisborne, would be farewelled at a tangi tomorrow.
Detective Senior Sergeant Martin James said officers today hoped to get a "better understanding of the circumstances surrounding the death".
A post-mortem examination was conducted by a pathologist on Saturday but further investigations were needed.