Why was Michael ostrog a suspect?

Answer 1

Mentioned for the first time as a suspect in the Macnaghten Memoranda, which said the following of him in 1894: Michael Ostrog, a mad Russian doctor and a convict and unquestionably a homicidal maniac. This man was said to have been habitually cruel to women, and for a long time was known to have carried about with him surgical knives and other instruments; his antecedents were of the very worst and his whereabouts at the time of the Whitechapel murders could never be satisfactorily accounted for. He is still alive. This account does not seem to tally very well with the pathetic petty criminal we see in the historical record.