Webas revealed in demon slayer chapter 144, titled successors, zenitsu’s letter brought him news about the sudden death of his master and former thunder hashira, jigoro.

Though if i remember correctly it's not.

The letter stated that jigoro kuwajima took his own life by committing seppuku.

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Webhis teachings were now accessible to an upper moon demon that could potentially take lives.

Webduring the hashira training arc, a bird brings zenitsu a letter explaining what happened, and shortly after we see him being all serious.

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