What happens to bodily matter and fluid (faeces and urine) when a person dies?!

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Generally, after a person dies the bladder and bowels will empty. It depends on how they died and the environment, but can happen minutes or hours after death.

For lack of the proper vernaculars, if a person dies, post rigor mortise, and there is weight on you then the feces and urine will just spew out. But, if body is just laying there, it will say in place. Most bodies, if taken to the morgue, they usually empty the stomach and other liquid filled areas out so that the body can decrease in decomposition.

They are expelled from the body when the muscles relax.

You've answered your own question really the muscles stop holding it back so it seeps out

Depending on the situation they died.
But it WILL eventually get out, either days or hours after death.