Dear Friends and particularly Jackie,
I do not recommend that you tell the N's newest woman about who and what he is. She is NEVER going to believe you, the evil ex, that he is an N. Remember, he has been filling her ears with falsehoods about you from the get go. Heaven only knows what he has told her but you can bet that it is nothing close to the truth. Remember, what N's do is lie. Pathologically lie. They lie even when the truth would serve them as well or better.
Because the ever persuasive N has convinced her that you are crazy, a b---h or worse, she will never believe (coming from you anyway) that he is, to put it bluntly, a nutcase. So while I admire your altruism, don't bother. All you'll do is potentially drive her closer to him. Instead, simply hope that she gets it earlier rather than later. Hope that her friends see him more clearly than she does and that she gets the red flag information from them. Hope that someone gives her a clue early on. Hope that there is enough info out there now for her to recognize narcissism when it hits her in the face, as it surely will.