Death is declared when there is either brain death or all efforts to resuscitate a person have failed. From the moment of death, physical changes will start to take place:
Within one hour: Primary flaccidity (relaxation of muscles) will occur almost immediately followed by pallor mortis (paling of the skin).
At two to six hours: Rigor mortis (stiffening of muscles) will begin.
At seven to 12 hours: Rigor mortis is complete.
From 12 hours: Secondary flaccidity will start and be completed within one to three days.
The moment of death is not necessarily painful. While people with certain medical conditions may feel pain at the end of life, others die painlessly. Often, people with terminal conditions like cancer receive pain medication so they are comfortable at the moment of death.
We often think of the moment of death as that time at which the heartbeat and breathing stop. We are learning, however, that death isn’t instantaneous. Our brains are now thought to continue to “work” for 10 minutes or so after we die, meaning that our brains may, in some way, be aware of our death.
verywellhealth.com
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