Mary of Bremen
A male hairdresser who was mentioned in the Scotland Yard files, had been arrested several times in Germany for assaulting women, stabbing them in the breasts and private parts with a sharp instrument. He had also attempted to rape a young girl in his barbershop. Suspecting they had a possible Ripper suspect the British police contacted their German colleagues, only to find that Mary, having just served a seven year prison sentence, had been rearrested immediately and was now serving a further twelve months, and was not due to be released until August 1889, therefore was in prison when the Whitechapel murders occurred. His nickname, Mary, apparently referred to his supposed homosexuality.
