Police are investigating a death at Hot Water Beach, Coromandel yesterday evening.
One person died, another was seriously ill and a third suffered minor injuries after the water emergency.
Emergency services were called to the beach at around 5:30pm after reports of a drowning.
A middle-aged man was given CPR on the scene, but could not be revived, police say.
Two others were taken to Thames Hospital by ambulance.
Police are investigating on behalf of the coroner.