A man riding a bicycle was fatally injured, and police believed he was the victim of a hit-and-run accident. Tiny clues found at the scene created a picture of the vehicle which struck him and led police to its driver.
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A fireman died from what appeared to be heart disease, but his family was skeptical of the cause of death.
When an 11-year-old girl disappeared from a small town in a remote area of Alaska, investigators wondered if she'd been attacked by a bear or become lost in the dense woods.
In 2008, the body of Colorado real estate developer Alan Helmick was found by his wife, Miriam, who then became the prime suspect.
Investigators sift through the ashes of a fire which killed a 40-year-old woman. The fire appears to have been started by an unattended cigarette. On closer look, forensic scientists discover the cause was far more complicated.
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.
Detectives search for the bombers of two churches in Illinois, hoping that the materials used in the remnants of the handmade bombs will offer the clues to catch the culprits.
Edward Honaker was sentenced to three life terms in prison, but he steadfastly maintained his innocence.
The investigation into the kidnapping and rape of an 18-year-old Ohio woman is aided when the victim returns hours after the incident occurred. With her help, the police are able to track the assailant to his front door.
In 1994, a human skull retrieved from an Ohio pond reveals a ghastly crime. Markings on the skull indicate that the victim had been stabbed multiple times and that the teeth had been removed with needle-nose pliers.
Who was the sexual offender who murdered two boys in Nebraska? The key to stopping him would be the unique composition of the "junk rope" he used to tie his victims.
The disappearance of Philadelphia college athlete Aimee Willard is investigated after her car is found on the roadside. When her body is found, the police find unusual marks and DNA evidence that eventually lead to her killer.
A man riding a bicycle was fatally injured, and police believed he was the victim of a hit-and-run accident. Tiny clues found at the scene created a picture of the vehicle which struck him and led police to its driver.
The victim had ingested a massive amount of cyanide. An unlikely clue - a flaw on a mailing envelope - exposed a murderer who was willing to kill innocent people.
A woman appears to have lost control of her SUV and plunged down an embankment into a shallow creek. But investigators suspect foul play when they find snowy footprints leading from the crime scene.
In 1994, a human skull retrieved from an Ohio pond reveals a ghastly crime. Markings on the skull indicate that the victim had been stabbed multiple times and that the teeth had been removed with needle-nose pliers.
In 1996, Indiana police identified Richard Alexander as the "River Park Rapist" who assaulted four women that year. Later, DNA analysis casts doubt on his conviction.
A young, attractive hairdresser was sexually assaulted and murdered in her own beauty salon. The evidence at the crime scene didn't match any of the suspects and the case went cold for ten years.
On a cold December night in 1993, Rose Larner stopped in a convenience store on her way to her boyfriend's house. She was never seen or heard from again. A tiny clue found years later revealed a tragic tale of drugs, romance and revenge.
A man who had committed crimes including murder was not caught. Almost 50 years later, advances in technology and handwriting analysis uncovered the criminal.
Who was the sexual offender who murdered two boys in Nebraska? The key to stopping him would be the unique composition of the "junk rope" he used to tie his victims.
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