According to Mexican beliveve there are three deaths total.
The first one, when the person knows that he's going to die someday. That moment of self-awareness, that moment when he knows he he is moratal and going to die someday, that's the first death.
The second death is when that person dies. When he is buried or cremated and there is no direct way to communicated with him. When he vanish from the world and can't be among us. That's the second death.