Cold Case Files Classic

Police run down more than 11,000 leads before coming up with a suspect in the murders of three Virginia girls; and the abduction and strangulation of a California woman continues to baffle investigators more than 11 years after the crime.

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.

After a long manhunt, cops finally close in on a serial killer with the help of the Internet and information supplied by a subsidiary of Microsoft. And a drug trafficker jumps bail.

A quarter of a century after the murders of two nurses, Canadian police suspect that a former Toronto cop committed the crimes.

In the 1980s, a serial killer prowled the posh streets of Orange County. Police were unaware of the serial attacks until 1996, when DNA revealed the killer's secret and they linked four murders to a single DNA profile.

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

After 46 years, LA homicide detectives take a Lover's Lane bandit who gunned down two police officers into custody. DNA testing helps lead police in Florida to a suspected killer, however the killer has an identical twin. Who is the real killer?

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.

Montana detectives track down a man who murdered his wife 25 years later after he's convicted of killing his third wife in Maine under similar circumstances; and after 15-year-old papergirl Penny Parker goes missing, a search volunteer finds her body.

Fifteen years after the murder of a Navy seaman, an undercover agent proves the wife had arranged a murder-for-hire; and a former state trooper claimed his estranged wife committed suicide.

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

In 1982 and '83, Seattle's Green River Killer stalked prostitutes like game. With 49 victims, he could be the deadliest serial killer in U.S. history. Then, a passing motorist spots a fire along a road in South Carolina and calls it in.

The murder of a 73-year-old man leads police on a long chase for a man who's suspected of identity theft and bears a rose tattoo with the name "Phyllis".

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.

NY detectives hunt a serial killer. A notorious suspect emerges in an old case. A tragedy sparks a victims' group, and DNA solves a girl's murder.

Police crack a cold murder case when a mysterious woman calls and says her boyfriend is the killer; and the 1998 murder of a woman provides clues to the '88 murder of actress Myra Davis, Janet Leigh's stand-in in "Psycho".

Testimony about larvae growth in dead bodies helps convict the man who stabbed a couple to death and strangled their 4-year-old daughter in 1993.

The cold murder case of a Texas woman is solved when the killer's plan to kill another woman and stuff her into a duffel bag goes awry; and an intrepid reporter doing a story on unsolved homicides helps crack a murder 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.

A Texas woman's murder is finally solved when the killer's plan to kill a second woman and stuff her into a duffel bag goes awry. Then, an intrepid reporter doing a story on unsolved homicides helps crack a case of murder.

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.

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.

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.