Seasons & episodes

A mother is suspected in the murders of two of her daughters, when her third daughter finally convinces police to reopen two cold cases.

A murderer's saliva, found on envelopes that he sealed, helps seal his doom 37 years after his first killing. And Colorado police crack a cold case 24 years later when they take a DNA sample from the victim's son that proves that his father murdered his mother.

Included: Los Angeles detectives solve a 46-year-old murder case; and DNA leads to a suspected killer who has a twin brother. Host: Bill Kurtis.

With access to the San Francisco Police Department's work, including saliva samples taken from letters the infamous Zodiac Killer sent 30 year ago, we reevaluate the case of the serial killer who began terrorizing California in the late 1960s.

While hiking with husband Dennis in Montana, Leslee Larson fell into Wolf Creek. Then Dennis is convicted of murdering his wife, while in Main. And 15-year-old papergirl Penny Parker goes missing, then her body is found by a search volunteer.

Included: the case of Douglas J. Wright, a former state trooper whose 1993 murder of his wife brought a conviction in 2003. Also: the murder of a Navy seaman. Host: Bill Kurtis.

A detective works for 15 years to nab a man who murdered his wife and dismembered her body to hide the sexual abuse of his children. Then, 20 years after the shooting murder of a gas station attendant, detectives get a lead.

The search for a killer with a distinctive tattoo is recalled. Host: Bill Kurtis.

Cold Case discusses the story of the nearly 20-year hunt for the man responsible for the murders of 49 prostitutes and other women in the Seattle, Washington area.

Police must wait nearly 30 years before advances in DNA technology give them the chance to convict the killer of a young hitchhiker, and Philadelphia police wage a 16-year hunt for the man who raped and killed a 10-year-old girl.

Detectives from three different departments in Westchester County, NY team up to track down a serial killer; and a man known as the Bus Stop Rapist becomes the lead suspect decades after a woman is found murdered under a hotel bed in the case.

Included: the 1988 murder of actress Myra Davis, Janet Leigh's stand-in for “Psycho,” brings a conviction in 2001. Also: a phone tip helps solve a cold case.

Testimony about the growth of larvae in dead bodies helps convict the man who stabbed a couple to death and strangled their 4-year-old daughter in 1993. And the 2001 murder of a young girl, whose head was cut off, remains unsolved.

A Texas woman's murder is solved when the killer's plan to murder another woman and stuff her into a duffel bag goes awry; and a reporter doing a story on unsolved homicides helps crack a case of murder that had been ruled an accidental death.

After 23 years, investigators finally track down the killers of an Atlanta policeman when the ex-wife of one of the killers phones in a tip; and a mother keeps the skeletal remains of the 3-year-old daughter she killed in a footlocker.

A prostitute who fights off a screwdriver-wielding man helps police track down a serial killer; and undercover agents acting as mobsters conduct an elaborate sting to solve a murder case that had gone cold for years. Then, detectives from three different police departments in Westchester County, New York team up to track down a serial killer.

A woman who takes down the license plate number of a car that had been following her helps police solve the murder of another young woman.; a phone call gives police the lead they need to solve a 30-year-old crime.

The testimony of three prison inmates helps convict a man who viciously killed a woman out for a bike ride nearly two decades prior; and a self-admitted sex addict who strangled his cat is a suspect in the 30-year-old murder of a neighbor.

DNA technology that take place over 20 years help police to finally identify the man who brutally stabbed two women to death; and an anonymous caller leads police to the killer of a 13-year-old girl who was shot dead and left in the woods.

Police suspect brothers J.R. and Coco Duvall beat two Michigan hunters to death, chopped up the bodies, and fed them to pigs; and a serial rapist, who holds a mini-flashlight in his mouth to blind victims, is nabbed when he drops it during an attack.

Four retired law enforcement officers, known as the Cold Case Cowboys, help track down the killer of a man wanted for rape and robbery; and police await for advancements in DNA technology before they can put away a killer.

A man suspected of the cold case murder of his wife and son hatches a new plot to kill his mother and father; and detectives solve the 20-year-old murder of a teenager by tricking her killer into licking an envelope, then extracting DNA from the saliva.

Police hunt for a man who killed three women in three different hotels, not far from one another in Des Moines, Iowa. And police get a killer to confess when they tell him prosecutors will show photos of the gruesome crime scene.

A dry cleaning tag inside a sweatshirt left at a crime scene helps police track down a serial killer and rapist who had been eluding them for years.