This episode originally aired May 23, 2019. Just weeks before a witness is to testify against the man accused of sexually assaulting her, she is murdered in the front yard of her own home. Investigators immediately suspect her attacker, but they don't have enough evidence to prove his guilt. It would take fifteen years, and the remarkable advances in forensic science and DNA testing which occurred during that time, to enable police to nail the killer.

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This episode originally aired May 20, 2019. An employee of a dry-cleaner was raped and murdered in the store, and investigators thought themselves fortunate to have two eyewitnesses. Their descriptions were similar but not identical, and the prime suspect didn't come close to resembling that person. So police turned to forensic science for the answers they needed.

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This episode originally aired May 16, 2019. When a young fireman died from what appeared to be serious but undiagnosed heart disease, his family and friends were devastated but they had no proof of foul play. Then they learned that, six years earlier in a nearby town, a young police officer died in the same way. The men had one thing in common: At the time of their deaths, they were married to the same woman.

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This episode originally aired May 13, 2019. A 33-year old woman meets, falls in love with, and marries a successful young doctor, but an unusual amount of discomfort during her pregnancy arouses her suspicions, prompting a personal investigation that culminates in a startling revelation.

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This episode originally aired May 9, 2019. The murder of an eccentric millionaire was not entirely unexpected; he flaunted his wealth and cared little for personal security. The evidence at the crime seemed to indicate robbery, but investigators wondered if there was something more.

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This episode originally aired May 6, 2019. The body of a businessman was found in his rental car. Teeth and bone fragments were all that remained of the body; When the victim's wife filed a life insurance claim, investigators sought the help of a forensic anthropologist.

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This episode originally aired May 2, 2019. The victim was well liked and successful, which made the brutality of the crime even harder to understand. In the final moments of her life, she'd written a name on the wall - presumably that of the killer - in her own blood. But this wasn't an open and shut case and, in order to solve it, investigators would have to read between the lines.

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This episode originally aired April 29, 2019. An elderly woman is murdered. Though investigators were able to lift prints from the scene, they failed to find a match and the crime went unsolved. Years later, advances in fingerprint science enable police to identify the print and the killer.

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