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narrator: mary certainly hadn't undergone chemotherapy. in fact, just a few days earlier, she'd been in perfect health. standard toxicology screens all came back negative. mary's case didn't make any sense to anyone. so, the medical examiner's office is stuck. they don't know what killed this woman. vannamee: they were looking at every possible angle, and they just did not have a conclusion. narrator: one test result ultimately did provide the answer to what killed mary yoder. but that result also raised a host of shocking questions about how it happened and who might be responsible. ♪