
Forensic Files
For six years, a serial killer prowled NYC. He wrote letters to police indicating he would kill twelve people.

For six years, a serial killer prowled NYC. He wrote letters to police indicating he would kill twelve people.

A man tells police he shot an intruder who killed his wife. Forensic evidence disproves that story later on.

The killer probably hoped to cover his tracks by staging the crime scene. But investigators saw through the attempt almost immediately.

On Halloween night 2004, Adriane Insogna and Leslie Mazzara were brutally murdered in their Napa home.

The murder of a millionaire indicated robbery, but investigators wondered if there was something more.

A six-year-old girl ran and hid when she saw her grandmother being beaten to death, but the man followed, beat and assaulted her. She said the assailant was her uncle, who was convicted.

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 2008, the body of Colorado real estate developer Alan Helmick was found by his wife, Miriam, who then became the prime suspect.

Two people in Seattle, Washington died after taking an over-the-counter pain reliever. Lab analysis of the pills showed they were tainted with a lethal concentration of cyanide.

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.

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.

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.

For twelve years, the murder of a young woman went unsolved, but with the passage of time came the development of technology. Could a used tissue found at the crime scene give police the evidence they need to bring a killer to justice?

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.

In 2006, Nevada politician Kathy Augustine died mysteriously during a hard-fought re-election campaign and the medical examiner could neither isolate the cause of death.

Police exhume the body of Karla Brown, murdered in her home in 1978, to study bite wounds, which eventually lead to the killer.

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.

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 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 1986, Gary Dale Larson was stabbed to death in his Edmond, Oklahoma home and then the killer sexually assaulted Larson's girlfriend Janet Haynes.