Saliva seals a killer's doom; DNA from the victim's son solves a murder; an arson investigator is accused of setting fires; a neighbor rapes, robs and murders an older woman.

A teenager leads police to the killer of three girls; a woman disappears from her sister's home.

The Internet assists police in finding a serial killer; drug trafficker jumps bail.

The national DNA databank helps police hunt down a rapist-killer; recreation of a shooting death proves it wasn't an accident.

A tool mark solves a murder; a disgruntled wife tells police that her husband is a killer.

Killer sets fires for insurance money; a prison inmate helps to solve a murder.

Killing of a medical examiner's wife; deaths of two babies.

DNA on a cigarette brings a rapist and murderer to justice; a confession made to a TV star helps police to solve a murder.

A murder victim's niece starts an advocate group; a car preserves a victim's body.

A Minnesota serial-killer, who targets waitresses, remains free for nearly 20 years.

A look into the crimes of a notorious white supremacist organization re-opens the case of a black truck driver who was forced to jump off a bridge to his death by members of the group, one of who faces criminal charges 32 years after the incident.

After receiving a crucial clue, police solve a woman's murder more than 20 years after the fact.

A woman's fall from a cliff leads police to uncover a series of grisly murders; investigators find crucial DNA evidence on a killer's cigarette butts.

A killer boasts of his crime to cellmates; police link a New Hampshire murder to one in Florida.

A woman helps to solve her mother's murder; an officer solves the murder of a newspaper-delivery woman.

A forensic anthropologist becomes an expert on the human body's rate of decay.

A fluke audit of a license-plate number leads police to a brutal rapist.

A New Orleans police officer goes undercover on a riverboat; a Wisconsin man goes on trial for a murder 10 years earlier.