"When I die, my wife has the right to inherit all my assets." is correct. Kai is right.

Yes, it is alright A better way can be: When I die, my wife has the right to inherit all my assets inherit = to receive (money, property, etc.) from someone when that person dies assets = everything you own

That legal document is called a Will or testament

the title is " My words of death"??? What do you call this kind of document, ? A document of a person who is going to die, he writes it.