Was Jack the Ripper a Jewish barber from Poland?

JTA:

The lead detective in the “Jack the Ripper” case believed the notorious London serial killer was a Jewish barber.

Handwritten notes by Chief Inspector Donald Swanson appear in the margins of a memoir by Robert Anderson, the assistant police commissioner. Swanson’s descendants, who donated the book to Scotland Yard’s museum on Thursday, said the detective was certain Aaron Kosminski, a Polish Jewish barber, was his man. Kosminski previously had been mentioned as one of a number of suspects in the gruesome series of killings of prostitutes in late 1880s London. Kosminski died in 1919 in an asylum.

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