In Her interview with Jonathan Ross the other day, when asked if She cried while writing the end of DH, JKR said that She "absolutely howled" after completing one of the chapters "near the end". She was so distraught that She took a mini-champagne bottle from the mini-bar and downed it, and went home with mascara smeared all over Her face. So, what was She howling about? What was so upsetting NEAR the end of the book? I don't think this was merely the end of the series. I think She killed off someone very close to Her heart. So, who? I am quite sure it has to be one of the Big Three. I'd put money on Hermione, based on Her reaction.