Forensic files

When the investigation of a woman's apparent suicide turns up some anomalies, investigators reopen the case of the suicide of another woman that had dated the same man.

In 1993, the Amtrak Railroad experienced the deadliest train crash in United States history, when the Sunset Limited derailed while crossing Alabama's Big Bayou Canot bridge. Forty-seven passengers and crew were killed; scores more were injured. The clues to the cause of the crash lay etched in twisted steel and buried in the mud of the Big Bayou Canot. Originally aired as Season 8 Episode 41

A fire erupted in the Kings Cross Underground Station in London, killing 31 people and injuring dozens more. Arson investigators were able to pinpoint the cause of the fire, but it would take state-of-the-art computer technology and experts in the field of fluid dynamics to explain why it became a deadly inferno.

A serial killer targets gay people in New York and New jersey. Can forensic evidence lead police to the killer?

As she left choir practice, the woman was gunned down in the church parking lot. Her husband became the prime suspect - particularly when police learned he found out just a month earlier that his wife had been cheating on him for three years. Originally aired as Season 14, Episode 4.

A Virginia teenager is murdered and her body is found in a ravine; investigators discover shell casings and a cigarette filter nearby, along with a shoe impression on her body.

Shamaia Smith disappeared from the strip club where she worked in East Hartford, CT. Police focus on local businessman Kenneth Otto when there are inconsistencies with his story. Otto's property is searched and cadaver dogs find something in a fire pit. Originally aired as Season 13, Episode 50.

For more than a year, angry, hateful letters were sent to a first grade school teacher in a small town in Pennsylvania. When scientists analyzed the letters, they found evidence that the sender knew a lot about the victim - more, in fact, than anyone could possibly have imagined. DNA analysis would eventually help seal the perpetrator's fate.

The 1990 murder of a Virginia woman is solved when new technology detects fingerprint evidence on a blood-stained pillow case.

When a nine-year-old girl goes missing, police and volunteers spend weeks searching for her. A psychic's vision leads to a field where her body is discovered, along with what investigators hope is enough evidence to help them to also find her killer. Originally aired as Season 13, Episode 19.

Digital enhancement of security camera video shows that what appears to be a casual encounter is actually a forced abduction, leading to murder. The perpetrator's MO is remarkably similar to another murder which occurred five months earlier, 15 miles away. When investigators learn the crimes might not be isolated or random, they also realize a serial killer may be on the loose.

A young woman is stabbed more than 100 times. The killer leaves DNA behind, but investigators must play a cat-and-mouse game trying to obtain a suspect's DNA to match. Will he make a mistake?

The bodies of a woman and her two daughters are found floating in Tampa Bay, Florida. Police discover a handwritten note in their car and hope it will solve the triple murder.

In an upscale Texas neighborhood, four young people are brutally murdered; a neighbor's eyewitness account helps produce composite sketches of two suspects dressed in black.

In 2003, Kathy Lorick was killed on a Concord, California jogging trail in the middle of the day while talking to her husband on her cell phone. The evidence from Kathy's cell phone records and search dogs lead nowhere. Nine days later, a witness tells police about a chance encounter and cigarette butts that contain the killer's DNA. Originally aired as Season 14, Episode 15.

Two family members are suspects in the shooting of a funeral director. Does the forensic evidence show which one was the killer?

A man's apparent suicide by drinking antifreeze turns into a murder investigation when forensic evidence seems to indicate the poison might have been administered by someone else.

A woman is stabbed to death in her bed. Investigators become suspicious after learning of a series of close-call incidents in her life.

A man's truck slips off the jack, crushing him and starting a fire. But the forensic evidence makes detectives wonder: was the man who was killed really the owner of the truck?

A deaf woman, caught up in a love triangle, is brutally murdered. Forensic scientists subpoena Yahoo records and find evidence at the assailant's residence.

A woman is found stabbed to death in her bathtub and her abusive ex-boyfriend becomes a suspect; footprints, including one on a hamburger bun, hold the key to solving the murder.

A woman is bound with electrical cords from a reptile tank heated rock, and murdered. Investigators are able to match forensic evidence to the owner of a boa constrictor living nearby.

A Texas housewife is murdered and her young daughter is attacked but survives. An in-law is suspected, but no arrests are made until DNA advancements help crack the case 15 years later.

A couple goes on a trip to Ocean City, Maryland, where they encounter another couple and disappear.

A Texas factory worker disappears, but her family does not believe it was voluntary.