When two women from the same town were murdered in the same way, police feared a serial killer was on the loose. At first they thought the victims had nothing in common until they found tiny clues linking them to the same man.
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Seattle police had no suspects in the violent murder of post-grunge singer, Mia Zapata. More than a decade passed before the evidence could be used by forensic scientists to identify the killer.
A suspect's former lover comes forward with a tale of murder, mutilation and cremation, but there's no way to test the story's validity until a plant pathologist and a dendrochronologist conduct tests where the cremation supposedly occurred.
A woman is found dead in a ravine, but crucial crime scene evidence had been washed away by severe thunderstorms. Almost 20 years later, an old hat brought the killer to justice.
A fireman died from what appeared to be heart disease, but his family was skeptical of the cause of death.
Nancy Newman and her two daughters are found brutally murdered. The crime scene has no shortage of evidence.
Soon after becoming pregnant by Dr. Maynard Muntzing, firefighter Michelle Baker's health quickly deteriorates. Eventually, she raises suspicions that Muntzing is doing her harm.
A man's wife took her own life and his college sweetheart killed herself the same way. Was it coincidence?
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.
In 1996, Derrick Duehren returned to find his Oregon home burned to the ground. His wife's charred remains were later found in the rubble.
In 2006, Texas real estate agent Sarah Anne Walker was found brutally murdered in a model home.
A teenager went missing after an evening of horseback riding. Her body was found a month later, three miles from her home. The killer unknowingly left trace evidence behind - tiny but unmistakable clues which pointed to him and him alone.
Robert Sims returned home after working the night shift and found his wife, Paula, unconscious on the kitchen floor. Their two-year-old son, Randy, was asleep in an upstairs bedroom, but their six-week-old daughter, Heather, was missing.
A healthy young man dies mysteriously in his sleep, and toxicology tests reveal a lethal dose of lidocaine in his blood.
The police investigate when a severed leg is discovered among garbage. Conventional means of identifying the victim are impossible, leading investigators to rely on DNA, forensic anthropology and toxicology.
Digital enhancement of security camera video shows that what appears to be a casual encounter is actually a forced abduction, leading to murder.
In rural Canada, Dr. John Schneeberger is accused of sedating and sexually assaulting one of his female patients and his stepdaughter. DNA tests demonstrate that the doctor is innocent, but the patient insists that he sedated and raped her.
A neighbor watched as a man stabbed his wife, pushed her into the swimming pool and held her head under water.
In 1991, a high school girl vanished after attending a party. The prime suspect had two alibi witnesses for the night she disappeared. A solid alibi can often overcome circumstantial evidence, but forensic evidence is another matter.
An obstetrician returned home from the hospital and found his wife on the bathroom floor. She was covered with blood and not breathing. He tried unsuccessfully to revive her, staining his clothes with her blood in the process, and then he called 911.
Three seemingly unrelated deaths proved to be serial murders. The killer used poison which had no taste.
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