In 2012, 32-year-old Irasema Chavez was found murdered inside her Arlington, Texas, apartment. Investigators recovered a drop of blood that did not belong to her, but the DNA led nowhere and the case went cold. More than a decade later, new technology gave detectives a name to investigate. To find out if they were right, they turned to something remarkably ordinary: a discarded plastic fork. What came back from the lab changed the case.

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