The person appears to be a/an Latino_Hispanic Female, approximately 10 to 19 years old.
Rigor mortis is when a body becomes stiff after someone dies. This happens because the body runs out of a special energy molecule called ATP, which helps muscles move. Without ATP, the muscles can't relax, so they stay tight. This stiffness usually starts a few hours after death and can last for about 12 hours.
Rigor mortis refers to the stiffening of muscles that occurs after death, which is an important aspect of the post-mortem process. This phenomenon happens due to the depletion of adenosine triphosphate (ATP) in the body, leading to muscle rigidity as the muscles can no longer relax. Typically, rigor mortis begins a few hours after death and can last for up to 12 hours, providing valuable information for forensic science and understanding the timeline of death.