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A dog finds an unrecognizable older lady's body in a park, with a bloody knife and bloody rain poncho nearby, plus doggy treats and an empty leash. Detectives locate the dog at a nearby vet, cleaned by the vet of trace evidence, but with the victim's bloody shoe. A lift in the shoe leads to identification of the victim, a health care worker whose duties included identification of the sources of patients' HIV infections. Eventually detectives suspect the victim's lawyer husband, who refuses to give a DNA sample, but donated at the blood bank, which informs that he was an Ecstasy and Viagra user.