Season 6 - Episode Guide

A serial killer in Spokane, Wash. murders prostitutes and leaves a bag with a smiley face on the victim's head.

Investigators work to solve a double homicide in the small town of Hudson, Wisconsin.

Officials look to state-of-the-art DNA analysis to help capture a serial killer in the Louisiana State University area of Baton Rouge.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

Investigating a series of fires in California's Sam Joaquin Valley that killed four, investigators determine a respected arson investigator may be the arsonist.

Police must use forensic science to solve the mystery of a prominent businessman whose burnt body is discovered.

A phantom white supremacist sect takes credits for bombings and bank robberies in Spokane, Washington, but FBI forensic photo analysts clear the picture.

When the prime subject for four factory deaths has a perfect alibi, investigators use video analysis, timeline reconstruction and a 3-year-old fingerprint to solve the crime.

Sixteen years after a college student is found raped and strangled on a buffalo bike path, DNA technology and other clues help catch the killer.