Ace dies in Episode 483 of the One Piece anime series. The episode is titled "Looking for the Answer - Fire Fist Ace Dies on the Battlefield". Aces death occurs during the Marineford Arc, where the Marines and the Whitebeard Pirates are battling to rescue Ace from being executed. Ace was captured by the Marines for his past affiliation with the infamous pirate Gol D. Roger, and the Marines ordered his execution as a means of deterring piracy. Ace dies while protecting his younger brother Luffy, who is devastated by his loss.