He had the charger on his chest and when it made contact with the water - he died!
The coroner has writtn a report to Apple urging them to put out a warning for the product, but so far Apple has not done it.
So we ar going to beat them to it - in case you did not know:
Don't charge your iPhone in the bathtub!
In fact don't put any electrical component in the bathtub..while you are in it... 
More here
