Police are investigating the death of an American tourist who apparently drowned while swimming with dolphins in the Marlborough Sounds.
The 27-year-old American woman was with Dolphin Watch Ecotours in Tory Channel when she was seen floating face down about 11am on Tuesday.
An ambulance spokesperson says the woman was pulled from the water but resuscitation efforts by a doctor and staff on the boat were unsuccessful.
Paramedics on a coastguard boat were transferred to the vessel but they could not revive her.
