Season 4

A new fingerprint identification system known as I-AFIS helps Texas detectives track down a killer after three years of searching. And a Georgia investigator gets to the bottom of a 16-year-old murder case when he discovers where the victim's body had been hidden -- in the bottom of a well.

Included: the 1998 murder of waitress Corey Parker in Jacksonville Beach, Fla., by Robert Erik Denney. Host: Bill Kurtis.

A bloody dagger and a phone tap help detectives solve a 20-year-old murder case. And DNA taken from an eyelash found on a dead prostitute's body brings a killer to justice.

A kidnapper grabs 8-year-old Chad Choice from his home in Texas, then torments his parents with two ransom demands. The case goes cold until the parents receive a chilling package in the mail that contains a letter--and a skull.