A mother of two young children was found dead in her bedroom. Her death was ruled a suicide - but when investigators learned she had almost died in a house fire three years earlier, they decided to take another look at the evidence.
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In 1996, Indiana police identified Richard Alexander as the "River Park Rapist" who assaulted four women that year. Later, DNA analysis casts doubt on his conviction.
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.
In 2004, Rebecca Barney and her soon-to-be ex-husband Fred were found shot to death in their Tulsa, Oklahoma, home, which had been set on fire.
A cop is found dead. His wife first says the motive was robbery then she tells police it was suicide.
A mother of two young children was found dead in her bedroom. Her death was ruled a suicide - but when investigators learned she had almost died in a house fire three years earlier, they decided to take another look at the evidence.
When the number of bloodstains at a scene were abnormal, it was up to forensic scientists to find out why.
A California teen went missing. Police suspected she'd run away until her body was discovered in a ditch.
In 1981, New York correctional officer Donna Payant disappeared and was later found in a landfill. The medical examiner not only identified the cause of death but also found an important clue.
A woman's death in Pennsylvania triggers a homicide investigation into another woman's death in North Carolina.
A drive-by shooting leaves one man dead and another seriously wounded. Cell phone calls and shell casings point to a suspect, but authorities are unable to place him at the crime scene.
A mother claims that an intruder murdered her two sons, but lacking a motive, police use blood-spatter analysis and behavioral profiling to reconstruct a different scenario.
Professional photographer Charles Rathbun claims model Linda Sobek died during a consensual sexual encounter gone wrong, but Sobek's corpse and some high-tech digital imagery tell a more sinister story.
An investigation of a pediatrician, prompted by the death of one of her patients, leads to a Texas hospital where the pediatric mortality rate is higher than at any hospital in the country.
A serial arsonist starts several fires that cause millions of dollars worth of damage and the deaths of three people. He is discovered, partly through the use of forensic hypnosis.
In 2002, a small community in upstate New York was devastated when Patty Wlasiuk died in a truck accident. But burdock seed pods found in her hair and on her clothes indicated that this was no accident - it was cold-blooded murder.
The wife of a murdered horse rancher explains that the last time she saw her husband was when he was leaving the house to go jogging. Police become suspicious when forensic evidence eventually leads investigators back to the ranch.
When a college co-ed vanished without a trace, her fellow students were concerned about her safety and their own.
After a Philadelphia convention, 180 legionnaires contract pneumonia-like symptoms and 29 of them die.
In the case of the Center City Rapist and the murder of Shannon Schieber, Philadelphia authorities use an anonymous letter and geographic profiling to hone in on a suspect.
Scott Dunn was missing and when the police sprayed his bedroom with Luminol, a scene of horrific violence emerged. Now investigators faced a daunting task.
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