Two murders may be linked despite the 12-year gap between the crimes. Investigators examine paint chips from a car and a scuffed cowboy boot to try to catch the killer.
The 2003 sniper attacks in Columbus, Ohio, and the technology that helped authorities identify the shooter.
Forensic detectives examine an empty cigarette pack and tiny metal fragments embedded in the jacket of a body found near train tracks in King County, Wash.
A husband-and-wife hunting trip leads to the man's death and sparks a murder investigation.
A murdered man's stomach contents are examined to determine the time of death and the killer's identity; a deadly car accident has investigators inspecting the airbag.
A 55-year-old Civil War buff disappears from a quiet town along the Mississippi River. A grisly find at a truck stop hundreds of miles away may be tied to the case.
The shooting deaths of two construction workers in a New Jersey motel are examined.
A 19 year-old woman vanishes from a rural community in Minnesota and detectives enlist a solar physicist's help to identify a killer.
A missing man's remains turn up in cattle country, and a toxicologist makes a surprising find in the case.
A girl goes missing in a small Canadian town in the 1950s. When her raped and strangled body is found in the woods near her home, her 14-year-old neighbor becomes the prime suspect.
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