This is only the second time a rahui has been placed on The Poor Knights Islands. In March, 2000, diver Astrid Malcolm died from an air embolism while diving at the Northern Archway at Tawhiti Rahi Island.
Ngatiwai put in place a rahui for the entire island for three days.
Usually a rahui is in place to stop people taking seafood from the site. However, because the Poor Knights Islands is a marine reserve it is to show respect after the death of a person.
Maritime New Zealand were supporting the police who were investigating the death.
A spokesman from Maritime New Zealand said it could be weeks before the investigation was complete.