Inside the St. Charles Police Department, there is a room full of thousands of files related to the man known as the I-70/35 serial killer.
St. Charles Police Detective Donald Stepp says there are 10 drawers that contain thousands of names, all possible connections to a 1992 crime spree that left six people dead across three states.
The I-70/35 killer got his name because several of his victims worked in stores just off of Interstate 70.
One of those victims was 24-year-old Nancy Kitzmiller, who was killed in a store in St. Charles.
On Sunday, May 3rd 1992, Kitzmiller was working alone at The Boot Village just off Interstate 70 at Zumbehl Road.
Read more: kmov.com
See the Unsolved Mysteries episode: