Rigor mortis

[Kai]

the stiffness of the joints (= places where two bones are connected) and muscles of a dead body:

[Justin Bieber]

Rigor mortis, which translates from Latin as stiffness of death, sets in quickly and usually ends three or four days after death. The condition results from a lack of certain chemicals in the muscles; it may be affected by muscular activity before death as well as the external temperature.