Answer:
Not always. Their is a difference between being dead and being actually dead. If you just died, meaning your heart has stopped pumping blood, you can still be brung back to life, or revived. If your actually dead, your brain will not be active even the slightest bit. You see, once your heart stops pumping, your brain can still be active for, on average, about fifteen(15) minutes. When your declared brain dead......well......your dead and can't be revived.
Another view: u are dead when the soul leaves the body along with the former. oh yeah and you get high. Try not to get caugt doin it or u do die and u r dead