Season 4

01 Pure Evil Episode 19th September 2012 The 1995 death of a Chicago woman whose body was found on a Wisconsin highway is detailed in the Season 4 premiere. 02 The Perfect Suspect Episode 216th September 2012 In Arkansas, three women are murdered over the course of three years. 03 Wolf in Sheep's Clothing Episode 323rd September 2012 The 1995 murder of an 8-year-old girl sparks a manhunt for her killer. 04 Blood Trail Episode 430th September 2012 The 1999 slaying of a young woman in Germantown, Wis., is recalled. 05 Mother's Day Murders Episode 57th October 2012 The 1985 murders of a young military wife and two of her daughters are investigated. 06 Gruesome Discovery Episode 614th October 2012 Recalling the 1994 murder case of a young mother who was beaten and left in a garbage bin. 07 A Bike Ride to Murder Episode 721st October 2012 The 1991 murder of a young girl in San Diego is investigated. 08 Murder on the Menu Episode 828th October 2012 The 2004 murder and dismemberment of a chef is investigated. 09 Triple Threat Episode 911th November 2012 The 1993 strangling death of a young mother in California is probed. 10 City Under Siege Episode 1018th November 2012 A look at the 2006 shooting death of a young nightclub worker in Scottsdale, Ariz. 11 Killings in Kentucky Episode 1125th November 2012 A 1993 triple homicide results in the deaths of a Kentucky veterinarian and his family. 12 No Mercy Episode 122nd December 2012 The 2001 strangling death of a mother of triplets in Puyallup, Wash., is investigated. 13 Maritime Murder Episode 139th December 2012 The 1982 poisoning death of a naval officer is investigated.