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.
In 1993, young mother Tammy Tatum was sexually assaulted and murdered in her Longmont, Colorado apartment.
Paul Gruber's daughter suspected something was wrong when she received birthday cards addressed from her father, but written in a stranger's handwriting.
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.
A woman who was known to have suffered from depression took her own life. But her sister told police that she said if anything were to happen to her there would be a note in the china cabinet.
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.
When two women went missing and were later found brutally murdered, police wondered if they were victims of a hate crime.
Paul Gruber's daughter suspected something was wrong when she received birthday cards addressed from her father, but written in a stranger's handwriting.
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.
Fifteen years later, DNA technology leads to justice for a murdered woman and her savagely beaten 4-year-old daughter.
In 2006, Darlene VanderGiesen received threatening emails and then disappeared. Tracking the source of the emails led police to the home of Daphne Wright, where they believe a murder was committed.
Police arrested a suspect for the death of a girl. But new technology proved the wrong man was behind bars.
In 1991, Grand Junction, Colorado is on edge after a series of deadly bombings kill two people and injure one more. Police race to find the culprit before he strikes again.
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.
The body of an attractive young woman was found a mile from her abandoned car. Police were especially concerned when they realized the victim had come to them for protection just two weeks earlier.
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.
The victim was a self-made man who never minced words. Perhaps he was murdered by a disgruntled client.
Foul play is suspected when Fort Worth factory worker Glenda Furch disappears after completing her shift.
A Michigan State University grad student disappeared and was presumed dead. With the help of a professor of geological sciences, police hoped to get the "dirt" on her killer.
The killer probably hoped to cover his tracks by staging the crime scene. But investigators saw through the attempt almost immediately.