well while in the future he dies when he goes to fight the androids. trunks said he was going with him but gohan went behind trunks and knocked him out so he couldn't come
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ANSWER: I don't remember the exact episode, but in the future Trunks' old present, Gohan died to save him (Trunks) -- he knocked him out. (("History of Trunks Dbz Movie"))
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Gohan died when Kidd Buu destroyed Earth straight after he was brought back from Buu's body. ((This can't be proven because Gohan was never found in the afterlife before the wish. Brolly had a move as a baby to save himself from a planet's destruction maybe Gohan did too.))
It was when buu was revived in like episode 210-220.
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In the Dragon Ball Z series, Videl finds out that Gohan is "dead" during the episode titled "The World Tournament." This occurs during the Majin Buu Saga, specifically in Episode 210. Videl is devastated upon hearing the news, not realizing that Gohan is actually alive and in hiding to protect his loved ones.
In the Original Series Gohan kills him in Episode 176 In the Remastered Series Gohan Kills him in episode 191
Cell gets killed by Gohan. The previous answer said that he went to "hell", which is untrue(since hell exists in the Christian religion), he went into the "afterlife"(where dead people go in DBZ).
no
He died three times one time in dragon ball and twice in dragon ball z