In the reality in which we live, all things die, ALL THINGS.
If you choose to live in a pseudo-philosophical/scientific world where we apply the rule that all matter and energy must continue to exist in one form or the other and that nothing is totally destroyed and gone forever but simply converts, then ALL THINGS CONVERT. Nothing stays constant forever. All stars CONVERT ("die" in my reality) sooner or later. All plants and animals of all kinds die.
Let me finish the circular argument:
Of course I know where this argument leads, but there is absolutely no proof that we convert to a higher spiritual plane or something of that sort where our "essence" is contained in some way anymore than a star does all that when it dies.