A fire leads investigators to re-examine an unusual death.

A young woman's naked body is discovered in a remote area leading forensic investigators on a search for clues to her identity and the identity of her killer.

When a Yale student mysteriously vanishes days before her wedding, investigators comb a secure research lab for clues.

An almost-perfect crime was discovered because of a suitcase.

A popular handy man in a New Hampshire town is found murdered and investigators follow forensic clues to a shocking conclusion.

A young mother is murdered in a crowded parking lot in broad daylight.

A serial killer terrorizes a small Texas town.

After the brutal slaying of a young couple on a road trip, the victims' families begin receiving disturbing letters.

The unexpected and strange death of a health conscious woman prompts an investigation.

After a young mom is found brutally murdered in her home, investigators find startling clues on her cellphone that could lead to her killer.

An amazing new forensic tool turns a cold case around.

A gruesome discovery in a small town church sends investigators on a search for a killer.

An insurance agent is shot execution style in his office in broad daylight, but the killer left no fingerprints and there was no murder weapon found at the scene… Then, investigators discover a critical clue invisible to the naked eye that cracks the case. (also marked as S1:E12)

A healthy, young mother mysteriously dies after a minor traffic accident triggering an investigation to find out what caused of her death.

Investigators search for clues after a body is discovered in a watery grave.