Nobody knows what happens after we die, which is why we need research such as this
I'm thinking about the new robocop movie. Re-animated brain in a robotic body
the brain shuts down and you cease being you
how long after that it can be brought back before it completely degrades, but at the moment when all that electrical activity has stopped you're pretty much already 'dead'
(although many prefer .22LR for that purpose due to noise levels).