Rigor mortis was a condition that caused temporary stiffness of joints and muscles after a certain period post-mortem.

In 2285, while investigating the Regula I station, Dr. Leonard McCoy discovered the corpses of several of the station's crew who had been killed by Khan Noonien Singh and his Augments, and determined that they had not yet undergone rigor, indicating that they had not been dead long. (Star Trek II: The Wrath of Khan)

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