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The 'Dear Boss' letter is one of the most famous communications attributed to Jack the Ripper. Sent to a London news agency, it mocked police efforts and introduced the name 'Jack the Ripper' to the public. The letter played a major role in shaping the identity and notoriety of the killer.
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Authorities examined the letter for handwriting and authenticity. While its legitimacy remains debated, it significantly influenced the investigation.