If a druid wildshapes into a wolf and is targeted with power word kill: dead or alive?

@JeremyECrawford If a druid wildshapes into a wolf and is then targeted with power word kill does the druid revert dead or alive?

— Bobby the Barbarian (@BobbyBarbarian) April 4, 2016

If you have 100 hp or fewer, power word kill causes you to die. Notice that it doesn't say you drop to 0 hp. #DnD https://t.co/MnVjACCIml

— Jeremy Crawford (@JeremyECrawford) April 4, 2016