From Jack the Ripper identified:
Private handwritten notes by the man who led the hunt for Jack the Ripper naming the chief suspect were given to Scotland Yard’s Black Museum yesterday.Chief Inspector Donald Swanson kept quiet for years but in retirement, frustrated that the murderer had escaped justice, could not resist scribbling notes in the margin of his boss’s memoirs, naming the man that they both believed had become the world’s most famous serial killer.
The man he named was Aaron Kosminski, a Polish-Jewish hairdresser living in Whitechapel, East London, who was eventually committed to a lunatic asylum, where he died.
According to Swanson the police were so convinced that Kosminski was the killer of at least five prostitutes in the 1880s that they organised a secret identity parade at a police rest home. The witness was a Jew who was said to have refused to give evidence.