Rigor mortis is caused by an inability of myosin to enter a weak binding state with actin.

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Rigor mortis is the stiffening of muscles after death due to the lack of ATP needed for muscle relaxation. During muscle contraction, myosin forms a strong binding state with actin to create movement. In a relaxed state, myosin and actin are in a weak binding state. Without ATP to release myosin from actin, the muscles remain in a contracted state, causing rigidity.

Rigor Mortis Is Caused by an Inability of Myosin to Enter