Detective Senior Sergeant Mark Dalzell said the victim was airlifted to Auckland City Hospital but died on the way.
The scene was immediately put under guard last night and overnight. A scene examination will be carried out today.
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Police are now speaking to a person who is helping with their inquiries, a statement said.
No one else is being sought in relation to what has been referred to as a "firearms incident".
"Our investigation is still in its early stages and a further update will be provided once there is further information available."