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)
Kill Now, Pay Later: When an arrest is made in the contract killing of a California businessman, police discover that's just the beginning of the story. (S8, ep 11)
Nightmare Field: Investigators search for 23-year-old Dalene Carlson after she is reported missing. But then a tractor operator makes a gruesome discovery in a cornfield. (S7, ep 11)
Dead End Trail: Fear grips the students of Southern Illinois University when the body of senior Susan Schumake is discovered near a popular campus trail. (S6, ep 11)
Little Boy Lost: When the body of 11-year-old Christopher Alan Brown was found in the Flint River in 1985, it took almost 20 years for evidence of his murder to be found. (S5, ep 11)