He does not die, when he fought Arima shortly after walking with Hide in his arms, he nearly died since Arima stabbed both of his eyes, going through a part of his brain, but luckily he didn't die, instead it wiped out his memory almost completely.
He does not. He only gets injured due to a fight with arima due to stabs in both eyes causing him to have serious brain damage and lose his memory. They then take Kaneki to CCG and rename him to Haise and make him apart of them.
Season 3 (Tokyo Ghoul:re, Season 1) The character of Haise Sasaki was introduced as a replacement for Ken Kaneki in season 3 of the anime but as it soon turned out, Haise Sasaki was actually Ken Kaneki. Namely, after his clash with Arima, he was left with serious brain damage but alive.
The short answer : Yes. The long answer: He regained his memories from "Ken Kaneki" inside his own head. Therefore becoming Ken Kaneki again. Yes but he now retains memory from both personality, i.e Kaneki as well as Haise.
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