Was Jack the ripper Aaron Kosminksi?

Kosminksi was a Polish Jew and his DNA was found on an apron near one of the victims.

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This must be a relatively new development, as DNA hadn't been discovered during the time when Jack was active. Kind of a pity, because they might have caught him otherwise.

But no, I can think of plenty of reasons why some guy's DNA would be on a piece of cloth belonging to a lady of the evening, and only one of those is murder related.