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brutally murdered. her little girl left to wonder in her mother's blood. police had a suspect and they say that he had a motive. >> we had an intimate relationship. >> ended up having sex. >> could they prove he was the killer? >> it was a circumstantial case, except for that witness, the girl who left those footprints. >> they will never know what cassidy saw and what she did not see. >> maybe she could not tell detectives who the killer was, but maybe she did not have to. >> the fact that cassidy was spared, would that mean anything to a jury? >> person who killed the mother cared ...

When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.