once a man dies is it true everything on him goes stiff?

I DON'T know about that area for sure ,however they do get stiff limbs , my uncle worked in a funeral polar and he told me when the body is so stiff they cant bend it to get a new suit over it they simply cut the suit down the back and tuck it under..he also told me a lot of expensive jewelery with diamonds get stolen in funeral polars after they close the session ,so be sure to ask for those items back after the session is over some rings are worth $10,000 or more .

Rigor mortis (Latin: rigor "stiffness", mortis "of death") is one of the recognizable signs of death, caused by chemical changes in the muscles after death, causing the limbs of the corpse to become stiff and difficult to move or manipulate.[1] In humans, it commences after about three to four hours, reaches maximum stiffness after 12 hours, and gradually dissipates until approximately 48 to 60 hours after death.