how did zero die in the nightmare before christmas

Zero was Jack's pet skeleton who served as a loyal companion and a symbol of hope in the dark and dreary town of Halloween Town. However, in the film, Zero meets a tragic end when he is swallowed by a massive fish while Jack is away. This event serves as a turning point in the story, as it prompts Jack to reflect on his own mortality and the consequences of his actions, ultimately leading him to a greater understanding of the meaning of Christmas.