Having searched twitter, blogs and the web it appears Natalie has passed away. Twitter messages indicate the funeral took place on Dec 13th, 2011.
I hope it isn't true but there are fragments of info out there for you to draw your own conclusions.
I suspect that she's still alive and has simply cut ties with the porn industry and the media. I'm not sure if she started the rumor of her death. But my guess is that she's done enough porn and wants to be alone. Hope she's happy.