Forgive me, but this is one of my hobby subjects of interest.
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Anyway most who study the case believe that the murder has been found out about 10 years ago. The first ever JTR book, which was written by one of the lead detectives, states - we knew who the murderer was at the time but lacked the evidence to convict. About 10 years ago a copy of this book that belonged to the other lead investigator was found. It had a named scrolled in the margin next to this statement. When the person that the name belonged to was investigated it was found that they had opportunity, motive, knowledge of the area, and were put into an assylum right after the last murder.
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The first sentence of the quoted section about is pretty false. I've read the main book about this suspect (James Tully's "Prisoner 1167"), and while it brings some interesting questions and gives a good overview of James Kelly (the suspect to whom you refer) it can't handle the fact that Kelly's main crime was killing his wife. He was otherwise a thief and a con artist, which for several reasons make him a less credible suspect than many others who have been suggested over the last 100+ years.
The Sickert hypothesis is terrible, representing a woman in search of damning her suspect after spending something like five million dollars on her "investigation." The number one rule in "Ripperology" is let the facts point you to your suspect, not the other way around.
Check out
www.casebook.org's message boards for some pretty damning comments on her theory.
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I've never understood the long-standing fascination with ol's Spring-Heeled Jack.
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Spring-Heeled Jack was a different character altogether, a killer who allegedly had all sorts of super powers and who appeared in "Penny Dreadful" stories of the day (actually a little bit earlier). Some people believe that Jack the Ripper (almost certainly a name that was never used by the killer himself but invented by the press) got his name from "Spring-Heeled Jack," but they're different people altogether.
--Erik