Digby posted on twitter it was the first time in more than two decades and 6500 tagged birds that this had happened.
Digby said there had been very hot, dry weather in Fiordland and Blake was fat.
The team was now putting measures in place in prevent this happening again to other kakapo.
Transmitters would continue to be used but extra care would be taken to avoid heat stress and similar issues.
Digby said an immediate step to avoid a repeat of the tragedy was to wait for the temperature to cool before attempting to find and capture kakapo.
The West Coast has been unusually dry with Greymouth and Westport breaking historical records for consecutive days without rain.