Early one morning, a woman went missing on her way to work. A strand of hair in her hairbrush led investigators to unravel the mystery. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Abby and Libby - two young girls murdered. Investigators are searching for the killer using their biggest clue: a recording of his voice from one of the victims' phones ordering the girls Down the Hill. Almost three years later, it's a mystery that still haunts the small town of Delphi, Indiana...and the police say the killer may walk among them.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

An investigator must think quickly to find a way to capture a shoe impression left to melt in the snow. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Police investigating the 1984 murder of a college student had plenty of suspects, but no conclusive evidence linking any of them to the crime. More than a decade later, sophisticated technology would breathe new life into a case grown cold with the passage of time. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

His daughter suspected something was wrong... and when she learned virtually everything had been removed from her father's home, she was sure of it. Even though she lived almost a thousand miles away, she took it upon herself to find out what happened and who was responsible. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The teeth had been removed from a human skull retrieved from a grave so the killer could keep the victim's identity secret. But did he? To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The crime scene was especially violent; A husband and wife had been shot to death in their bedroom. At first, investigators thought their 16-year-old daughter was lucky to have escaped unharmed... but after awhile, they wondered if the reason she was alive had more to do with careful planning than good fortune. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Even though their daughter had run away before, she'd always come back. Her parents were sure this time would be no different... but they were wrong. Workers discovered the teen's half-naked body on the other side of the road; her throat had been slit. Police hoped the single foreign hair found in a defensive wound on her thumb would lead them to the killer. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A serial killer was strangling prostitutes then leaving the bodies in plain sight. The only clues were a tire impression and some threads. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

When the wife of a noted doctor goes missing, authorities believe it may have to do with an allegedly shady adoption ring. But then her husband goes house-shopping with another woman claiming to be his wife, and a friend finds a strange pile of concrete in his backyard. Investigators use the concrete and the hazy recollections of a young child in an attempt to find the missing woman. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

When a severed leg is found in a dumpster, investigators are faced with the challenge of identifying the victim. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Twenty-four years after the death of a 15-year-old in California, forensic scientists discover enough microscopic evidence to finally bring the killer to justice. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A beautiful model goes missing. No one can clue to her whereabouts until a park employee discovers photographs in a trash dumpster. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A woman's body was found at the bottom of the stairs. When an investigator recreates the fall, the results are surprising. Was this just a freak accident, or murder by an angry spouse. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

It was one of the most unusual cases in forensic history. Investigators had to find a way to solve a murder case with evidence which consisted of a squashed tomato found at the crime scene, and tiny, pinpoint reflections of light in a photograph. Would it be enough to catch a killer? To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The news of a flight attendant's brutal murder prompted the son of a victim who had been killed five years earlier to contact police. The MO of both murders was remarkably similar, and analysis of the biological evidence from the crime scenes proved that these were serial killings. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A woman is shot to death but the case's prime suspect has a solid alibi: a video of his activities the day of the murder. Police asked a local professor to help them verify the tape, and he enabled them to see the killer hiding in the shadows.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Six-year-old Nicole Rae Walker was killed in a hit-and-run in her Ft. Lauderdale neighborhood. This was the first case in the United States where video animation was considered admissible to show to a jury.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The murder of a surgeon in an apartment community left police in St. Petersburg, Florida baffled. Cell phone mapping, wiretapping and a host of other forensic evidence would uncover a conspiracy, and bring the doctor's killers to justice. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A woman's death in Pennsylvania triggers a investigation into another woman's death in North Carolina. The similarities in the cases were striking, and medical examiners must determine if the suspect's story about accidental drowning is all wet. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A college senior was found raped and murdered near an unpaved footpath used by students to walk from one side of campus to the other. Five years earlier, a student was assaulted and killed in her off-campus apartment, and a year after that, another student was killed in almost the same way. Police feared a serial killer was on the loose and they needed to determine what - or who - these women had in common. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

When a student is reported missing, police believe she'd turn-up a few days later. But when they discover blood in her boyfriend's bedroom - which someone had gone great lengths to hide - they know this case is going to be different. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The media dubbed him the “Last Call Killer” because he targeted men in gay bars who were obviously intoxicated. His MO involved dismembering the bodies and wrapping the parts in plastic bags, which he then carefully washed to remove all incriminating evidence. He eluded capture for almost ten years... and then new technology revealed fingerprints no one knew were there. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A woman's dead body is found in a public park. When a knife through to be the murder weapon turned up, investigators had an opportunity which seldom occurs: to compare the microscopic marks on the weapon with the marks on the victim's body. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The crime scene was awash with blood. Analysis showed it had come from two people, one of whom was female. The male DNA was the victim's, which meant the killer was a woman. Leads dried up and the case went cold... until a suspect arrested for drug possession offered police a deal, and told a bizarre tale of an exotic dancer who listened to voices in her head. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The bodies of two women are found in the ashes of a fire, which appeared to have been set deliberately. Evidence found leads investigators to a suspect, but it would take a blood stain no bigger than the head of a pin to convict him. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Two different men telephoned 911 to report a woman had been murdered; neither knew the other had called. Examination of bloodstains, a discarded candy wrapper, and a few tiny seeds enabled forensic scientists to determine who committed the crime. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

An aspiring model turned up dead, and the prime suspect was her boyfriend. When he was eventually cleared, investigators had to dig deeper to find the perpetrator. With the help of a forensic geologist, they identified the most unlikely suspects. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

For seven years, a trio of men robbed one bank after another. They always got away before the police arrived, and they left no evidence behind. But the way they stood and the clothes they wore told a story... a story that could be read by forensic scientists. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Painstaking forensic analysis of a murder victim leads police to a suspect, who turned out to be the same person who made what he thought was an anonymous 911-call. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Two young women were brutally murdered in Napa, California on Halloween night. The killer left his DNA behind, and a groundbreaking test revealed his race and even the color of his eyes and hair. Technology was able to tell investigators what he looked like... now all they had to do was find him. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A woman's body was found on a deserted road outside of San Antonio. After years, the victim's family hired a private investigator who finds her personal diary and uses its entries to find the perpetrator. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A heart surgeon is found dead in his home. Police assume suicide, but further investigation reveals his new wife was out for money. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Bruce Miller was shot to death in the office of the business he owned. When a computer expert examined the computers owned by the victim’s wife and by her lover, he found the evidence needed to convict the person responsible for the crime. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

It appeared the victim had accidentally fallen and hit her head at the bottom of the stairs. But the odd position of her shows and the absence of blood splatter led police to suspect the scene had been stage... and Luminol proved they were right. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A woman who survived a deadly childhood fire sends police a letter charging her father killed her mother 30 years ago. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A federal agency ruled a fire that killed a child intentionally set, charging the mother with murder. Were government officials wrong? To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A young college student is found dead in her apartment. There are no obvious signs of foul play, but skin cells under her fingernails yield DNA of an unknown male suspect, and petechial hemorrhages in her eyes prove this is a homicide.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A 12-year-old's death shakes a suburban Minnesota town. Police have no leads until a string of burglaries months after the murder leads them to the victim's possessions, and to the killer.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

After a day of fishing in a small village in Switzerland, a teenage boy did not return home as planned. His body was found in a cornfield, but investigators found microscopic one-cell organisms on him, which could only be found in water.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

In 1993, worldwide attention focused on robberies which targeted tourists in Florida. Some vacationers were killed in thee attacks; some fought and survived, despite severe injuries. A bite mark is the key used to convict a suspect.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A pregnant woman is brutally attacked in her own home and her unborn child is killed. Was her husband wrongly convicted?To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The truck fell off the hydraulic jack, crushed the man working beneath it, and sparked a fire... or so it seemed. Investigators turned to forensic science to determine if they were dealing with a tragic accident or a carefully orchestrated murder.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A funeral director is murdered and his son, the sole beneficiary of his estate, is considered a likely suspect... until witnesses provide him with an ironclad alibi. When police find a mask near the crime scene, they hope it will lead to the killer.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

A serial killer in Arlington, Va., leaves the same clues behind at each crime scene. To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Orange fibers may link a van and a murdered girl's body.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

Three homicides on two continents look like professional executions. Investigators on both sides of the Atlantic needed to find out if they were related and, if they were, who or what they had in common.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The woman was missing for a month. Police find her car but no evidence of foul play... only a fingerprint and a set of keys. There's a code on one of the keys, which they hope will unlock not only a door, but also the mystery of her disappearance.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

For six years, a serial killer prowled the streets of New York City. He wrote letters to police and "The New York Post," indicating he would kill twelve people, one for each astrological sign. Forensic astronomy, handwriting analysis, and DNA extracted from the flap of an envelope gave investigators a profile of the killer, and a stroke of luck enabled them to find him.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices

The woman could have lost control of her SUV on the icy road, and plunged down an embankment into a shallow creed, But there were footprints in the snow leading away from the vehicle and bloodstains on both the inside and the outside. Investigators were convinced this was the scene of a crime, not an accident.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices