Chapter 214 during his fight with Riou.
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chapter 469 and through
I don't want to spoil this for you, but yes, Kiyomaro (Kiyo) does die in the manga, but only temporarily after a fight with Riou. Gash (Zatch) doesn't want to accept his death, so he starts pounding on Kiyomaro's chest to wake him up, and that gets Kiyomaro's heart beating again. From there, Momon gives him CPR and they manage to resuscitate, him, but he is left in a verybrief coma while he recovers.
Volume 46, chapter 425
Naruto shippuuden starts at chapter 245 in the Naruto Manga
Arystar Krory will not die but he will be comatose I think he will manga chapter 159