A person who dies for their country is often referred to as a "patriot" or a "fallen hero." In military contexts, they may also be called a "soldier" or "martyr." These individuals are typically honored for their sacrifice and commitment to their nation's values and safety.
A taxidermist.
CREMATION
You would call them a martyr
A person from another country is typically called a foreigner or an international person.
An emigrant is a person who leaves their country to settle in another country.
heir --- It is not an Heir. An Heir is what you call the people who receive something from a will or a trust. A person who dies leave a will is a Testator.
exile
pedomihner
A patriot.
Ambassador
Ambassador.
A traitor