My remark about a diary got me thinking about it:
http://www.dailymail.co.uk/news/article-4767434/Jack-Ripper-s-diary-authentic-says-expert.html
Another long-shot suspect:
https://en.wikipedia.org/wiki/Frederick_Bailey_Deeming
OK, OK, fine. You got it out of me. I am D B Cooper. Now get off my lawn.