The "Dear Boss" letter was a message allegedly written by the notorious unidentified Victorian serial killer known as Jack the Ripper. Addressed to the Central News Agency of London and dated 25 September 1888, the letter was postmarked and received by the Central News Agency on 27 September. The letter itself was forwarded to Scotland Yard on 29 September. Although many dispute its authenticity, the "Dear Boss" letter is regarded as the first piece of correspondence signed by one Jack the Ripper, ultimately resulting in the unidentified killer being known by this name.