This episode originally aired January 10, 2019. A speck of bicycle paint and a speck nickel tie a suspect to the murder of a 9-year-old.

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This episode originally aired April 16, 2018. A couple is found dead in their Washington home and all signs point to a professional hit. A palm print and two distinct shoe impressions help police separate fantasy from reality and expose a fatal flaw in one state's inmate release procedures.

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This episode originally aired April 12, 2018. The woman hadn't shown up for work in two days, and her boss reported her missing. When her body was found, the evidence pointed to suspects who claimed they had nothing to do with the crime. The victim, herself, would help police to prove they were lying.

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This episode originally aired April 9, 2018. Hikers near Anchorage, Alaska discovered a body wrapped in sheets which were edged in orange stitching. Authorities hydrated the fingers and obtained a fingerprint, enabling them to identify the victim. Clinging to the sheet, they also discovered a tuft of red carpet fibers -- threads of evidence which led them straight to the killer.

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This episode originally aired April 5, 2018. For 18 years, a man who murdered his entire family eluded the FBI. Investigators used art and forensic science to find the killer.

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This episode originally aired April 2, 2018. When a teenaged girl goes missing, no one knows if she ran away or if she was the victim of foul play. Everyone's worst fears are confirmed when a body is found at the bottom of an isolated ravine. Police scour the crime scene, hoping to find enough evidence to identify the killer.

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This episode originally aired Mar 29, 2018. A woman was ambushed in her driveway and shot to death. During their investigation, police learned that a co-worker half her age was in love with her, and that she'd spurned his advances. They now had to determine if love had turned into obsession... and a motive for murder.

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This episode originally aired Mar 26, 2018. A possible false confession forces investigators to reopen the case of a missing six year old. A decade later, a fresh look at new evidence leads them to someone hiding in plain sight.

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This episode originally aired Mar 22, 2018. The bodies of three women were found floating in Tampa Bay. The water washed away any evidence, but police hoped a handwritten note found in the victims' car would lead to the killer - so they posted huge copies of the note on five highway billboards.

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This episode originally aired Mar 14, 2018. The victim had been sexually assaulted and stabbed to death on the beach, just ten yards from the hotel where she was staying. A pair of men's tennis shoes was discovered near her body. Police were sure that if they found the man who fit the shoes, they would also find the man who committed the crime.

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