ST. CHARLES, Mo. — Nancy Kitzmiller was a 24-year-old employee working at Boot Village in 1992 at Bogey Hills Plaza when her dead body was tragically found in the back room of the store by customers.

Investigators may be closing in on solving the mystery of the 'I-70 Killer' case more than 34 years later. In the spring of 1992, an unknown serial killer claimed the lives of six store clerks in 29 ...