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.
Security cameras in a casino tracked a young woman's movements until shortly before she disappeared. She was never seen again.
In one of the most brazen crimes of the 20th century, the chairman of the Coors Brewing Company was kidnapped.
A security guard disappeared from his post without a trace his remains were found a year later in a remote camp site.
Two suspects are linked to a murder by bloodstained boots and a gun, but the owner of the items says he has never met the victim.
In 2007, the Florida mobile home of Effie and Michael Ratley catches fire. Michael heroically rescues his wife and infant son. A month later, his wife is found beaten to death in a bedroom of his parents' home.
In 2003, Tiffany Rowell and three of her friends were brutally murdered in affluent Clear Lake, Texas.
It's usually easy to determine how a criminal entered the crime scene. But in this case, it was far from clear. It looked like the killer vanished into thin air...and perhaps he had.
A fireman died from what appeared to be heart disease, but his family was skeptical of the cause of death.
The body of a young girl was discovered on isolated farmland near Delano, California. She had no ID, but police found mailbox keys in the pocket of her jeans.
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.
In 2000, the body of exotic dancer Rachel Siani was found beneath a New Jersey bridge. Investigators wondered if she had committed suicide.
When a woman went missing, friends and family were determined to find her. Their worst fears were confirmed weeks later when her body was discovered.
When an off-duty policeman was shot dead, his fellow officers were determined to solve the crime. They needed clues to find the killer and they discovered them in tiny fibres and an asthma inhaler.
A bomb, constructed to cause as much damage as possible, kills a victim with deadly force and flame. When a search yields some tiny clues, police are able to identify the killer.
A man's wife took her own life and his college sweetheart killed herself the same way. Was it coincidence?
In 1969, phone operator Diane Maxwell is murdered. Her brother promised he'd find out who was responsible.
There was no clear reason for a young, healthy college student to be dead. But when the coroner discovered a tiny clue during the autopsy, investigators were able to uncover a mystery.
In 1969, phone operator Diane Maxwell is murdered. Her brother promised he'd find out who was responsible.
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.