Corrections officer Jason Palmer would still be alive today had threats against him been reported to prison bosses, an inquest has heard.
The 33-year-old died after he was punched by inmate Latu Kepu on May 15 last year.
Mr Palmer was escorting the Killer Beez gang member out of his cell for his daily hour of exercise at Springhill Prison at Hampton Downs, about 65kms south of Auckland.
Kepu hit Palmer, who fell backwards and hit his head. He died in Middlemore Hospital the next day.
Gavin Dalziel is acting regional manager of prisons in the Northern Region, including Springhill, and told the inquest today that every threat against a prison officer must be reported to bosses and put on file.