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.
In 1991, Dorothy Donovan was murdered in her Dover, Delaware home and police are skeptical when her son Charles Holden stated that she was murdered by a hitchhiker he had picked up.
In 1987, the death of Crystal Purcell was considered an accident. Then in 2001, Barbara Purcell called police to suggest that her estranged husband had killed Crystal.
In the 1990s, the media dubbed Richard Rogers the "Last Call Killer" because he targeted men in gay bars.
How did the stalker obtain the security system code for his victim's home? How did he steal her personal photographs? Police needed answers and they found them in the most unlikely of places.
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.
The wife of a respected police officer was murdered in her own home. The crime went unsolved for more than a decade, until a newly formed cold case unit took a fresh look at the evidence.
A young woman is stabbed more than 100 times. The killer leaves DNA behind, but investigators must play a cat-and-mouse game to obtain a suspect's DNA to match.
When a hit-and-run accident claimed the life of a high school athlete, everyone in town mourned his passing. Finding the killer was a long shot at best.
A brutal murder, lots of suspects and conflicting evidence but the forensics were clear on one thing: The killer knew his victim. And that alone gave investigators a head start.
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.
Kathy Lorick was murdered on a Concord, California jogging trail while talking to her husband on her phone.
Volunteers and police spend weeks searching for a missing girl. A psychic later leads them to a field where the body was found.
When a college co-ed vanished without a trace, her fellow students were concerned about her safety and their own.
In 1969, phone operator Diane Maxwell is murdered. Her brother promised he'd find out who was responsible.
In 1996, Virginia Beach police arrive at the Makdessi apartment to find Elise Makdessi and her lover dead.
A surgeon is stabbed to death, and the most likely suspect is seen in a restaurant at the time of the murder.
When a dedicated, well-respected teacher disappeared, police had to determine if she'd gone on vacation without telling anyone, or if she was the victim of foul play.
In little more than a month, two women who lived in the same apartment complex were brutally murdered.
A woman was shot to death in her Connecticut driveway. Now police must determine if love had turned deadly.