Firestar losses a life and Rainfur dies. Plus a lot of rats but that's not important.
Thornclaw
Firestar Quest (1- 510 pgs). ~HoneyGirl13~
Firestars Quest, BLuestars Prophecy, and Skyclans Destiny..There are also the manga books.
His mentor was originally Longtail, but when he got blinded his mentor became Thornclaw.
He will die with all of Thunderclan by his side, even some Starclan warriors like Bluestar and Yellowfang. He dies from his wounds in the battle with the Dark Forest.
Firestars quest is not a comic book and hardly has any pictures.
Smallear dies defending ThunderClan's camp from the badgers in the book "The Darkest Hour" by Erin Hunter. He bravely fights alongside his Clanmates but unfortunately succumbs to his injuries during the battle.
Do you mean Willowpelt. If you did she died in Firestars quest but if you actually mean Willowbreeze. Than I don't know. Sorry! ;-p
If you mean Firestar from the Warriors series by Erin Hunter, he hasn't died yet in the books the author has written so far.
The book after Crookedstar's Promise is Into The Wild, as of now. Crookedstar's Promise ties in with Bluestar's Prophecy, and soon to be in the same era is Yellowfang's Secret. So, Bluestar's Prophecy is after Crookedstar's Promise, then it leads to Into The Wild.
Smallear.
One-eye.