S4E1 - Pure Evil
The 1995 death of a Chicago woman whose body was found on a Wisconsin highway is detailed in the Season 4 premiere.
Sept. 9, 2012, midnight
S4E2 - The Perfect Suspect
In Arkansas, three women are murdered over the course of three years.
Sept. 16, 2012, midnight
S4E3 - Wolf in Sheep's Clothing
The 1995 murder of an 8-year-old girl sparks a manhunt for her killer.
Sept. 23, 2012, midnight
S4E4 - Blood Trail
The 1999 slaying of a young woman in Germantown, Wis., is recalled.
Sept. 30, 2012, midnight
S4E5 - Mother's Day Murders
The 1985 murders of a young military wife and two of her daughters are investigated.
Oct. 7, 2012, midnight
S4E6 - Gruesome Discovery
Recalling the 1994 murder case of a young mother who was beaten and left in a garbage bin.
Oct. 14, 2012, midnight
S4E7 - A Bike Ride to Murder
The 1991 murder of a young girl in San Diego is investigated.
Oct. 21, 2012, midnight
S4E8 - Murder on the Menu
The 2004 murder and dismemberment of a chef is investigated.
Oct. 28, 2012, midnight
S4E9 - Triple Threat
The 1993 strangling death of a young mother in California is probed.
Nov. 11, 2012, midnight
S4E10 - City Under Siege
A look at the 2006 shooting death of a young nightclub worker in Scottsdale, Ariz.
Nov. 18, 2012, midnight
S4E11 - Killings in Kentucky
A 1993 triple homicide results in the deaths of a Kentucky veterinarian and his family.
Nov. 25, 2012, midnight
S4E12 - No Mercy
The 2001 strangling death of a mother of triplets in Puyallup, Wash., is investigated.
Dec. 2, 2012, midnight
S4E13 - Maritime Murder
The 1982 poisoning death of a naval officer is investigated.
Dec. 9, 2012, midnight