False. This statement confuses two distinct postmortem changes. **Rigor mortis** is the stiffening of the body's muscles and joints that begins 2–6 hours after death, peaks around 12–24 hours, and then gradually dissipates over the next 24–48 hours. It is caused by biochemical changes in muscle fibers as adenosine triphosphate (ATP) is depleted, leading to a permanent cross-bridge formation between actin and myosin filaments. The cooling of the body after death is a separate process called **algor mortis**. Algor mortis is the gradual loss of body heat until it equilibrates with the ambient temperature. The rate of cooling is influenced by factors like body size, clothing, ambient temperature, and humidity. Both rigor mortis and algor mortis, along with livor mortis (pooling of blood), are used by pathologists as early, though somewhat variable, indicators to estimate the postmortem interval (time since death).

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