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[Something like this happened before. Different motel, no direct call to Reid, but there are similarities.
Same weapon. Same parties involved: Nathan and a prostitute. This time, however, the blonde prostitute is the one bleeding all over the bed, cut open from navel to sternum, dressed in nothing more than black lace panties. She is unambiguously dead.
Nathan is dressed in his customary long-sleeved shirt. His hands and the knife still clutched in one are covered in blood. His sleeves probably are, too, but they're black. Sensible. If he has any concern about being caught, it doesn't show. The teenager is eerily calm as he surveys his handiwork.