For 10 points, give this name given to the unidentified perpetrator of several gruesome murders in the Whitechapel district of London in 1888.
A letter written by this man was addressed George Lusk and is believed to be authentic, unlike the "Dear Boss" letter. Elizabeth Stride and Catherine Eddows were the subjects of the "double event" orchestrated by this man, who attached what is believed to be part of Eddows' kidney to his "From Hell" letter and also removed the heart of Mary Jane Kelly. Frederick Abberline investigated the crimes attributed to this man, who was theorized to be Lewis Carroll, among dozens of others. For 10 points, give this name given to the unidentified perpetrator of several gruesome murders in the Whitechapel district of London in 1888.
A letter written by this man was addressed George Lusk and is believed to be authentic, unlike the "Dear Boss" letter.
Jack the Ripper