As I recall a Chief Inspector Swanson report cited in Letters from Hell said the GSG handwriting did not match Dear Boss. I don't think GSG is anything more than an interesting piece of set decoration. It would be wholely unique for a killer to stop immediately after a murder to leave a message in a spot like that. Not next to the body or all the close by. Writing it between the two murders doesn't hold for me either, if we're talking about a serial killer. Having to leave a body unfinished to the extent that he/she needed to immediately find another victim but takes time out for a message that doesn't have any connection to the killings? Doesn't work for me. Could it have been written before the Stride murder? That might be a bit more possible and the only way that I could see JtR actually being its author.
How far was GSG from Stride's location compared to Eddowes?
How far was GSG from Stride's location compared to Eddowes?
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