Beverly Jean Long of Jackson, Georgia is put on trial for murdering her husband James on a cold night in 2003 and setting their home on fire. The state's experts say it was clearly arson. But defense experts say it was an accident.

It would take forty-six years, handwriting analysis, and new fingerprint technology to solve the 1957 murders of two California police officers.

A van strikes down a bicyclist in the middle of the night. Pieces of orange plastic left at the scene become part of a jigsaw puzzle that helps solve the crime.

Investigators must determine what caused a house fire that killed an elderly couple and whether the victims' son is responsible.

Detectives are suspicious after a woman is killed in a hunting accident, but it takes more than twenty years before a trace evidence analyst is able to match fibers on a soiled blanket to the killer.

Hunters make a grisly find in a Texas canyon: a human skull. Crime scene analysis reveals bits of clothing, a woman's shoe, some small bones and one strand of hair. An anthropologist determines the victim was a Caucasian woman who had been stabbed repeatedly. A forensic artist reconstructs her face and police eventually learn who she was. Now all they have to do is find her killer.

A married couple decided to escape the cold of winter with a vacation in Key West. The wife went missing and police searched every inch of the island; they found nothing but a pair of sandals that may have belonged to her. Then two pieces of video surfaced and investigators started to wonder if they should be searching for a missing person or a murderer. Originally aired as Season 10, Episode 7.

An Army wife's death appears to be a suicide, but detectives are suspicious when they learn that the woman almost died in a house fire a few years earlier.

The violent death of an Air Force officer's wife outside a Philippines air base is examined, amid accusations of a love triangle involving the murdered woman's husband. Investigators use groundbreaking computer forensics to make their case.

Bombings are difficult to solve, because the perpetrator isn't usually at the scene, and the evidence goes up in smoke. But there are clues if investigators know where to look. In this case, pieces of plastic the size of grains of sand held the key to a man's murder. Originally aired as Season 10, Episode 10.

The wife of an Air Force officer was found dead in her bed, with a plastic laundry bag near her face. At first glance, it appeared she'd been doing laundry, fell asleep, rolled onto the bag, and suffocated. But further investigation proved that the scene had been staged. Her death wasn't an accident; it was cold-blooded murder. Originally aired as Season 10, Episode 11.

When a fire destroyed most of a home and a young boy went missing, police organized the largest search in the history of their small town. First the boy's backpack was discovered five miles from home, and then his body was found 50 miles away. But the killer had been careless, and the evidence he left behind would lead police directly to him. Originally aired as Season 10, Episode 12.

A highway patrolman was dispatched to what he thought would be a routine traffic accident. While he had no formal training in forensic science, he had seen hundreds of accidents, but none had had as much blood as this. He was shocked by the coroner's ruling of accidental death. Then, an anonymous phone call breathed new life into his investigation. Originally aired as Season 10, Episode 13.

The decomposed body of a young woman was discovered in a Bakersfield irrigation canal. If there was trace evidence, it had been washed away. Another victim was found in that same canal a year later; this time, the perpetrator had been careless. The shoe prints found at the scene would lead police to the most unlikely of killers. Originally aired as Season 10, Episode 14

By reconstructing DNA, molecular biologists help Baton Rouge police catch a serial killer.

On Valentine's Day, an obstetrician finds his wife dead and calls 911. However, police discover inconsistencies between the blood spatter evidence and his version of events.

Weed analysis and photogrammetry are used to help solve the 1995 murder of a California teenager who was found dead after disappearing from her home.

When police recovered the submerged car of a man reported missing, they expected to find his body - but it wasn't there. His broken eyeglasses were on the floor of the vehicle and the interior was coated with motor oil. The investigation which followed would uncover an obsession turned deadly, and the motive for murder. Originally aired as Season 10, Episode 18.

Emergency dispatch received a call from a man saying his girlfriend shot and killed herself. Police found the victim in the caller's house, lying in a pool of blood with the gun next to her on the floor. The autopsy revealed the gunshot wound was not self-inflicted, and the evidence found on her body gave police a golden opportunity to catch her killer. Originally aired as Season 10, Episode 19.

'Four on the Floor' dealt with New Mexico law enforcement's successful effort to find and convict the killer of Betty Lee, a Navajo mother of five who was found brutally slain in a remote area near Farmington, N.M.. Once the police investigation led to Robert Fry, currently a death row inmate in New Mexico, it was learned that Fry might also be connected to other violent crimes in the area. This eventually led to Fry and an accomplice being suspected of the murder of Donald Tsosie, a Native American man found slain near the Navajo reservation, as well as to the deaths...

A brilliant young architect was poisoned and died just before she was to testify in a criminal trial.

An employee of a drycleaner was raped and killed in the store, and investigators thought themselves fortunate to have two witnesses. Their descriptions were similar but not identical, and the prime suspect didn't come close to resembling that person. Police turned to forensic science for the answers they were looking for. Originally aired as Season 10, Episode 22.

The murder of an eccentric millionaire was not really unexpected; he showed off his wealth and cared little for personal security. The evidence at the crime seemed to lean towards robbery, but investigators questioned if there was something more. Originally aired as Season 10, Episode 23.

The disappearance of a woman last seen in a grocery-store parking lot in Colorado is investigated. The probe turns up bloody gloves and strange tire tracks.

A car carrying three young men pulls alongside another on an Alaskan highway and a shot is fired, leaving a passenger in another vehicle dead. One of the passengers in the killer's car agrees to testify against his friends. The resulting trials don't end the carnage.

A college student was found dead, and the evidence suggested he knew his killer. Three hairs and some microscopic cells helped police to unravel a web of lies, and find the motive for murder. Originally aired as Season 10, Episode 26.

In an affluent suburb of Philadelphia, police were called to the scene of what appeared to be an accidental drowning. The investigation gradually focused on one person, a suspect who had more than a million reasons to want the victim dead. Originally aired as Season 10, Episode 27.

When two women from the same town were killed 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 very small clues linking them to one man. Originally aired as Season 10, Episode 28.

A young woman was found dead on a golf course in the Bahamas. The grass on that course was so distinctive that it had evidentiary value. The evidence led police to two suspects. Each blamed the other, and they had to find out who the killer was. Originally aired as Season 10, Episode 29.

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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 that pointed to him and him alone. Originally aired as Season 10, Episode 30.

When a popular disc jockey was found murdered in a community garden, police swung into action. A sniffer dog and a blood spatter expert led police to the killer... and he'd been much closer than they realized. Originally aired as Season 10, Episode 31.

When a woman's husband was gunned down in his own garage by intruders, investigators worked tirelessly to find the assassins. But when they discovered that a wound sustained by the grieving widow during the attack may have been self-inflicted, they turned to science to help them unravel a twisted tale of lust, greed and deception. Originally aired as Season 10, Episode 32.

Three seemingly unrelated deaths proved to be serial murders. The killer had been careful - he used poison which had no taste or odour. Fortunately for investigators, it also had a unique chemical signature. Originally aired as Season 10, Episode 33.

The crime scene was awash with blood. The victim had been brutally murdered as he slept in his own bed. There were no foreign fingerprints in his home, but investigators did find a shoe impression in the mud outside... physical evidence they hoped would lead them to the killer. Originally aired as Season 10, Episode 34.

While on the phone with 911, a woman is murdered in her bathroom, during a break in at her home. The investigation's strongest evidence is a shoe print on a piece of glass.

The owner of a historic restaurant killed. Investigators uncover tales of debt and deceit. But the case remains open, until one detective gets inspired by an earlier episode of "Forensic Files", and looks for clues in an empty holster.

A serial arsonist was on the loose in Washington, DC. Each of the fires was started with the same type of incendiary device. The perpetrator was very careful, and seemed to leave no evidence behind... but there were clues in the ashes and it was up to forensic scientists to find them. Originally aired as Season 10, Episode 37.

When a woman was found dead in her bathroom, the evidence pointed to suicide. But a coroner's inquest and a unique application of forensic science gave investigators a different explanation for her death. It was a theory that, if true, could turn the grieving husband into the prime suspect. Originally aired as Season 10, Episode 38.

Three homicides on two continents looked like professional executions. Investigators on both sides of the Atlantic needed to find out if they were related and, if they were, who or what they had in common. Originally aired as Season 10, Episode 39.

A 29-year-old woman was killed instantly when a bomb exploded in her home. The device was so powerful that shrapnel was imbedded in houses across the street. The bomber had not only knowledge and skill, but also a motive for murder. Originally aired as Season 10, Episode 40.

A killer tried to destroy everything which could link them to the crime. But in doing so, they inadvertently created new forensic evidence - evidence which came to light using a technique never before used in a criminal investigation. Originally aired as Season 10, Episode 41.

A Kansas City attorney is beaten to death in his office and suspicion falls on his business partner.