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I’m no doctor but……..
What is rigor mortis?
After death, the body undergoes a series of changes that occur in stages. Rigor mortis is the third stage after death, in which the muscles harden and become stiff, caused by the lack of adenosine triphosphate (ATP), which gives energy to the muscles. Rigor mortis is a significant tool for any death examination because it can narrow down the time frame of death.