I haven't read the book but thanks to a comment on youtube spoiling it, it made me curious. JAYFEATHER, LIONBLAZE, AND HOLLYLEAF ARE KITS OF CROWFEATHER AND LEAFPOOL!!!!!!! OMG! I KNEW IT! lol, now what? I can't believe Hollyleaf died, all because her father was in Windclan, making her half-clan. She is related to Breezepaw!!!!! OMG! lol, many omgs! I'm still gonna read the book.
Found out more, though still haven't read the book. It's rumored that she's still alive, but to her brothers she's dead. She died because she had murdered Ashfur, her being half-clan, and being a medicine cat kit. All was too much for her and she went insane.