 The concentration of the killings around weekends and public holidays and within a few streets of each other has indicated to many that the Ripper was in regular employment and lived locally . Others have thought that the killer was an educated upper @-@ class man , possibly a doctor or an aristocrat who ventured into Whitechapel from a more well @-@ to @-@ do area . Such theories draw on cultural perceptions such as fear of the medical profession , mistrust of modern science , or the exploitation of the poor by the rich . Suspects proposed years after the murders include virtually anyone remotely connected to the case by contemporary documents , as well as many famous names who were never considered in the police investigation . Everyone alive at the time is now dead , and modern authors are free to accuse anyone " without any need for any supporting historical evidence " . Suspects named in contemporary police documents include three in Sir Melville Macnaghten 's 1894 memorandum , but the evidence against them is circumstantial at best . 
