Sherry Eyerly disappeared while delivering pizzas in 1982. A man was convicted of her murder, but her remains have never been found.

The case of serial killer Paul John Knowles

5 serial killers who were never identified or caught

The case of Scott Lee Kimball, a modern American serial killer

The Bear Brook murders, a bizarre case that stretches all the way back to the mid 1980's

The Brabant Killers terrorized Belgium in the early 1980's, but they've never been identified.

Exploring the West Mesa murders, a series of unsolved murders in Arizona thought to be the work of a serial killer

A series of unsolved murders in Santa Rosa, California

5 female serial killers