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Signs of death or strong indications that a person is no longer alive are:
Cessation of breathing
Cardiac arrest (No pulse)
Pallor mortis, paleness which happens in the 15–120 minutes after death
Livor mortis, a settling of the blood in the lower (dependent) portion of the body
Algor mortis, the reduction in body temperature following death. This is generally a steady decline until matching ambient temperature
Rigor mortis, the limbs of the corpse become stiff (Latin rigor) and difficult to move or manipulate
Decomposition, the reduction into simpler forms of matter, accompanied by a strong, unpleasant odor. -Wikipedia