"I'm sorry darling, my battery has never run out before ..."

Not to mention, Where would you put the switch? Perhaps somewhere it can be easily reached by your flight companion? An that would only be the start of it, thanks
radeng.
In order to avoid too much about the details there is:
- Seeing that death has occured
- Medically qualified pronouncement of death
- Legal certification of death
As with so many other things to do with life and aircraft - it's complicated by being in international airspace and an a/c may land at it's native base with a dead native on board or arrive down the line with a native of a third country who was travelling alone. Etcetera!!