Can be death position change, eyesignatures, Death is the irreversible cessation of all biological functions that sustain an organism. For organisms with a brain, death can also be defined as the irreversible cessation of functioning of the whole brain, including the brainstem, and brain death is sometimes used as a legal definition of death. As it pertains to human life, death is an irreversible process where someone loses their existence as a person. Definition of death by heartbeat and breath. Brain death Death, the total cessation of life processes that eventually occurs in all living According to the whole-brain standard, human death is the irreversible cessation of functioning of the entire brain, including the brainstem.