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In 1990, Florida police were on a frantic search for a killer. Terrorized motorists heard of the bullet-ridden victims of the Interstate Killer - but the investigative trail was cold and there was no end in sight (Repeat).

A look at the dealmakers and hangers-on surrounding convicted serial killer Aileen Wuornos -- "America's first female serial killer." (Repeat).

A spotlight on the person behind the deadly "Zodiac Killer" who terrorized Northern California in the late '60s to '70s. (Repeat).

As the anonymous killer continues his reign of terror, he taunts the public with cryptic clues. (Repeat).

More than 900 Americans died in an isolated jungle in northern Guyana in November 1978. Jim Jones, has gone down in history as a madman who drove his followers to suicide. But the truth is more complicated and more tragic than that. (Repeat).

More than 900 Americans died in an isolated jungle in northern Guyana in November 1978. Jim Jones, has gone down in history as a madman who drove his followers to suicide. But the truth is more complicated and more tragic than that. (Repeat).

A woman disappears after church services, leaving behind a car with no gas and a missing emergency fuel can. When her body is found days later, the search begins for her abductor, who is thought to be driving a van. (Repeat).

Police hunt for the killer of a girl found dead in Washington after going missing on the Fourth of July. (Repeat).

Two murders in a South Carolina community are investigated. (Repeat).

The case of a serial rapist is examined. (Repeat).

A baseball bat proves helpful in the investigation of a Kentucky businessman's shooting death. (Repeat).

The investigation of a mother's tragic fall while vacationing with her family. (Repeat).

The woman in the back of the truck was flailing her arms, screaming. They thought she was doing something dangerous for the fun of it. But when they found a jacket near a pool of blood, they knew what they'd seen wasn't a joy ride; it was an abduction. (Repeat).

When court clerk Peter Porco doesn't report to his work in November 2004, a courts officer is ordered to the Porcos' family home in Bethlehem, NY. Inside the home, he finds murdered Peter Porco and his barely alive wife Joan who had both been savagely attacked with a fireman's axe. Eventually, a DNA sample may lead to the killer. (Repeat).

Detectives think they've solved a murder when they find the weapon and victim's blood in a man's flat, but the evidence may have been planted. (Repeat).

A rhinestone dog collar and a hypnotist aid in the investigation of multiple church bombings in Illinois. (Repeat).

There was no clear reason for a young, healthy college student to be dead. But when the medical examiner discovered the tiniest of clues during the autopsy, investigators were able to uncover the mystery filled with betrayal and revenge. (Repeat).

A small saliva sample serves as a vital clue to solving a cold murder case. (Repeat).

A woman disappears after church services, leaving behind a car with no gas and a missing emergency fuel can. When her body is found days later, the search begins for her abductor, who is thought to be driving a van. (Repeat).

Police hunt for the killer of a girl found dead in Washington after going missing on the Fourth of July. (Repeat).

Two murders in a South Carolina community are investigated. (Repeat).

The case of a serial rapist is examined. (Repeat).

A baseball bat proves helpful in the investigation of a Kentucky businessman's shooting death. (Repeat).

The investigation of a mother's tragic fall while vacationing with her family. (Repeat).

The woman in the back of the truck was flailing her arms, screaming. They thought she was doing something dangerous for the fun of it. But when they found a jacket near a pool of blood, they knew what they'd seen wasn't a joy ride; it was an abduction. (Repeat).

When court clerk Peter Porco doesn't report to his work in November 2004, a courts officer is ordered to the Porcos' family home in Bethlehem, NY. Inside the home, he finds murdered Peter Porco and his barely alive wife Joan who had both been savagely attacked with a fireman's axe. Eventually, a DNA sample may lead to the killer. (Repeat).

Detectives think they've solved a murder when they find the weapon and victim's blood in a man's flat, but the evidence may have been planted. (Repeat).

A rhinestone dog collar and a hypnotist aid in the investigation of multiple church bombings in Illinois. (Repeat).

There was no clear reason for a young, healthy college student to be dead. But when the medical examiner discovered the tiniest of clues during the autopsy, investigators were able to uncover the mystery filled with betrayal and revenge. (Repeat).

A small saliva sample serves as a vital clue to solving a cold murder case. (Repeat).

A 33-year-old West Virginia husband and father seemingly dies in an accidental house fire, but a closer look at the scene reveals a more sinister case. (Repeat).

July 4th weekend leads to tragedy for a California family. To catch a killer, detectives use an unorthodox technique, analyzing bug fragments, to help put a murderer behind bars. (Repeat).

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A cold case involving the 1993 murder of a college student is investigated. (Repeat).

The murder of a pregnant woman is investigated. (Repeat).

A man is murdered in a small Michigan town. (Repeat).

A brutal attack on an artist in her Orlando apartment is investigated. (Repeat).

A man is murdered in broad daylight and police uncover a slew of suspects. (Repeat).

A professional woman disappears in broad daylight and her body is found in the woods days later. (Repeat).

The shooting death of a mother of two is investigated. (Repeat).

The murder of a 55-year-old woman in her Hanover, Pa., home is investigated. (Repeat).

Examining an unusual murder case in Pennsylvania involving a man found dead nearly 100 miles from his home. (Repeat).

A young scientist's death is probed, and evidence found in the man's hair leads investigators to his killer. (Repeat).

A bullet-riddled car, a missing driver, and no witnesses. Was this an ambush or a random attack? Had the victim been abducted or was she dead? The answers lay in a unique clue so tiny it was measured in millionths of a meter. (Repeat).

A 13-month investigation into the murder of a teen runaway is detailed. (Repeat).

The investigation into two suspicious apartment fires in Seattle points to a serial killer. (Repeat).

Detailing the case of a University of Illinois science major who disappeared. (Repeat).

A flight attendant is brutally murdered in her own home and the laundry list of suspects is growing by the minute. (Repeat).

The murder of a Florida restaurant manager in an apparent robbery gone wrong is investigated. A bloody fingerprint left at the scene leads to a suspect other than the robber. (Repeat).

A Florida woman's rape and murder takes 18 years of scientific advances to solve. (Repeat).

In April 2002, a wild fire in a secluded parking lot leads police to discover the dreadful homicide of David Nixon, with the suspect's image caught by security cameras. (Repeat).

The investigation into an Arizona surgeon's murder is the focus. The police initially believe it was a random act, but later uncover evidence that points to a wealthy suspect motivated by jealousy. (Repeat).

A look at a case more than a decade old involving a Maine mother's murder. The only witness was her 12-year-old daughter. (Repeat).

Examining an unusual murder case in Pennsylvania involving a man found dead nearly 100 miles from his home. (Repeat).

A young scientist's death is probed, and evidence found in the man's hair leads investigators to his killer. (Repeat).

A bullet-riddled car, a missing driver, and no witnesses. Was this an ambush or a random attack? Had the victim been abducted or was she dead? The answers lay in a unique clue so tiny it was measured in millionths of a meter. (Repeat).

A 13-month investigation into the murder of a teen runaway is detailed. (Repeat).

The investigation into two suspicious apartment fires in Seattle points to a serial killer. (Repeat).

Detailing the case of a University of Illinois science major who disappeared. (Repeat).

A flight attendant is brutally murdered in her own home and the laundry list of suspects is growing by the minute. (Repeat).

The murder of a Florida restaurant manager in an apparent robbery gone wrong is investigated. A bloody fingerprint left at the scene leads to a suspect other than the robber. (Repeat).

A Florida woman's rape and murder takes 18 years of scientific advances to solve. (Repeat).

In April 2002, a wild fire in a secluded parking lot leads police to discover the dreadful homicide of David Nixon, with the suspect's image caught by security cameras. (Repeat).

The investigation into an Arizona surgeon's murder is the focus. The police initially believe it was a random act, but later uncover evidence that points to a wealthy suspect motivated by jealousy. (Repeat).

A look at a case more than a decade old involving a Maine mother's murder. The only witness was her 12-year-old daughter. (Repeat).

Authorities are quite sure that the death of a grandmother at Christmas has no foul play but it doesn't not match to some things found on the scene. (Repeat).

A true crime hobbyist connects a Utah Jane Doe to an Ohio missing persons case, leaving detectives hard-pressed to solve the decades-old murder. (Repeat).

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The story of a Norris City, Ill., couple who went fishing, and never returned. (Repeat).

The investigation of the 2011 murder of recent Mercer Law School graduate Lauren Giddings in Macon, Ga., is recounted. (Repeat).

The investigation into the 2006 murder of Omaha-based actress Pasinetta Prince is recounted. The case took several twists and turns until 2009, when a suspect was arrested. (Repeat).

The Kathryn Horn case is detailed. The Traverse City, Mich., teenager went missing in 1994. The initial investigation led the police an underworld of hippies, witches and cults, but a break didn't come their way for 20 months, when a mushroom hunter discovered Horn's body in the woods. (Repeat).

The murder of a woman in the living room of her Nashville home is investigated. (Repeat).

The disappearance of an 18-year-old freshman from the University of South Alabama is investigated. (Repeat).

The disappearance of an Air Force staff sergeant in San Angelo, Texas, causes the community to rally around his new bride, but investigators soon realize that there is something sinister going on. (Repeat).

The murder of a former homecoming queen in Rock Hill, S.C., is examined. (Repeat).

A family walk in on a burglary, resulting in a double murder. The case is initially tied to a series of local thefts, but the probe reveals a different motive and killer. (Repeat).

A young Washington couple are murdered and a professional hit is suspected, but evidence leads the police to a different culprit. (Repeat).

The 2006 murder of Barbara Mullenix in Huntington Beach, Cal., is investigated. The victim was stabbed more than 50 times and her body was dumped in Newport Harbor. (Repeat).

The murder of a state-park worker is investigated. (Repeat).