If you have a dream about the death of a dead woman this just means that you haven't yet come to terms with the loss of her life yet. You are going through a lot of problems and it is causing you to think of them in a negative way or to think about them in terms of their death. This does not mean you are thinking badly about that woman, it means that you are just putting your heart and soul into caring about her because of how important she once were and their memory still is to you. You can't give up that love, you just have to let it out because it is the only way that you will be able to get past their memory and make sure that you have some closure. This is of course talking about a dream in which you are imagining the death scene of a woman that you know that has died in real life.
Dreaming of a dead woman means you have some serious issues which need to be resolved with your sexuality. If you dream of seeing a random dead woman it means that you feel as if your sense of femininity is dying out and there is nothing you can do to protect it. This may not seem so awful if you are a male, but you need that sense of femininity just as much as a woman does. It is still important to the integrity of your character. Everyone has a sense of the opposite sexuality in them which allows them to function normally as a normal human being would, it is essential for this to exist the way it does. Without that part of you, you will be different, and not necessarily any better.