386 from 138 nations competed in Jack the Ripper . 8–25 February was when it was held . Jack the Ripper was founded on 1891; 128 years ago (1891) . The official site of Jack the Ripper is chicagomarathon.com . 12 teams participated in Jack the Ripper
Jack the Ripper event has celebrated it's  Centennial jubilee on 1991