The autopsy on the badly burned body of Charles "Jack" Lynch led investigators to search for a couple of killers.

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A couple embarks on a holiday but never return. Police suspect drugs are the reason behind their disappearance. Days later a random burglary breaks the case wide open. Police use ballistics and DNA to capture to unusual suspects.

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A family interrupts a burglary in their suburban home. The gunman kills two and wounds two more. Police suspect the crime is related to a string of thefts in the area, but a closer look at the crime scene reveals the real motive and killer.

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Denise Johnson was found dead in an Arizona forest with little forensic evidence around her. Could history be made in a courtroom with the utilization of plant DNA as evidence?

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Early one morning, a woman went missing on her way to work. A strand of hair in her hairbrush led investigators to unravel the mystery.

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A woman is murdered on a jogging trail in the middle of the day. The leads from cell phone records and search dogs go nowhere. Nine days later, a witness tells police about a chance encounter, and cigarette butts which may contain the killer's DNA.

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Twenty-four hours after her face-to-face meeting with a man she met online, the woman and her soon-to-be-ex-husband were shot to death. Only the computer had been taken from her home, and with it, the means to identify the killer.

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Police discover a decomposed body had been stuffed in a barrel 30 years earlier. An address book was found with the body.

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The story of how a routine missing-person case became a murder inquiry involving a love triangle.

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Forensic scientists provide authorities with evidence that a death deemed accidental 20 years ago was actually murder.

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