Kajamba: I didn't feel like cluttering the IC thread, so I'll write it here. I'm more and more of the opinion that McCarthy, as helpful as he acted when the police got there, was mixed up in it horribly. If he wasn't Jack, I bet he knew who it was. First and foremost in my mind is why Mary was allowed to rack up such a large amount of back rent and not be evicted. I wonder if it's really a coincidence that it wasn't McCarthy who was out and about and first found Kelly's body. Also: this is fairly recent I think, so you might not have turned this up: McCarthy owned practically everything in Dorset Street as of 1888. All the victims had connections to Dorset Street - so conceivably they were all known to McCarthy.
Another interesting tidbit was that No. 26, McCarthy's home, and No. 27, his shop, both of which were directly in front of Miller's Court, were owned by another man, McCarthy only leased them. The man who owned the buildings was named M. Barnett. I raised a question on some messageboards about that - is it a coincidence Kelly's boyfriend was Joe Barnett? And that she was killed very soon after kicking him to the curb?