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Everything died but chief, cortana and arby. There could be another grave mind if just one spore lived and found food then it would spread and it wouldn't be long before you had another grave mind(if you want to learn more about halo lore just buy this book at or rent it at the library like I did, the book is called "Halo Encyclopedia" it a gold mine of halo info) So yes, grave mind did die on halo 3 but grave mind is a title like a king, when a king dies his heir will then bear the title and become the king, grave mind is kinda like that except when grave mind dies the flood have to regain size before another is created again. I hope this helps

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