Deadly Forest: The tragic story of 17-year-old Michele Avila, who was murdered by two school friends in the Angeles National Forest in 1985. (S5, ep 1)
Pure Evil: When the naked body of a Chicago woman is found dumped on a Wisconsin highway, investigators suspect she may be the victim of a lovers' spat which turned deadly. (S4, ep 1)
Perfect Family: A family are found murdered in their home. Only their 20-year-old daughter has survived. Investigators wonder who would kill this seemingly perfect family. (S3, ep 1)
The Bathtub Killer: A look at the tense search for Bathtub Killer Dale Devon Scheanette, who was executed in 2009 for murdering two women in Arlington, Texas. (S3, ep 13)
Cold Fusion: Cops go on the hunt for a killer when the leading advocate for the controversial science of cold fusion is beaten to death. (S8, ep 12)
Little Girl Gone: The 1988 case of a missing nine-year-old girl went cold until an encounter at a bus stop breathed new life into the investigation and revealed the truth. (S7, ep 12)
Nightclub Nightmare: When a robbery at a popular Texas nightclub leaves one dead and two critically wounded, investigators are in a race against time to catch the killer. (S6, ep 12)
When Evil Strikes: Detectives race to solve the murder of North Carolina factory worker Jonathan Blackwell, whose body was found two years after he disappeared in 2004. (S5, ep 12)
No Mercy: When a mother of triplets is found dead in her Washington home, detectives piece together her final moments to reveal the surprising identity of her killer. (S4, ep 12)
Random Acts Of Madness: Years after a father is shot after a night of revelry, an unrelated cold case and a person's guilty conscience finally brings his killer to justice. (S3, ep 12)