Season 3 premiere. An attack on a Pennsylvania family that left only one survivor is discussed.

The 1994 murder of Missy Grubaugh is discussed.

The murders of three Arlington, Texas, teenagers in 1985 and the subsequent homicide investigation are discussed.

The 2002 slaying of a Brunswick, N.Y., couple is investigated.

Investigators in San Diego search for a serial killer after six females are slain in 1990.

The 1997 murder of Henry Caneva and the investigation that nabbed his killers are discussed.

The hunt for burglars who killed a Lafayette, La., man the day after Hurricane Katrina hit the Gulf Coast is chronicled.

The 1992 murder of Angel Ormston and the investigation that nabbed her killer are discussed.

The murders of three women in three Iowa hotels between 1993 and 1997 and the investigation that nabbed the killer are discussed.

The lethal poisoning of a waitress in Florida is investigated.

The murder of a gun advocate in Kentucky and the investigation that nabbed her killer are discussed.

The murder of a man in Maine is connected to a cold case.

The crimes and apprehension of the Texas Bathtub Killer are discussed.