Trama

The detectives launch a search for a serial killer who raped and murdered two women in Central Park.

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.—Anonymous

A female victim is found by two men walking their dog in the park. The victim is so brutally beaten she is unrecognizable. She may have been walking her dog also when she was attacked. After a brief search, the missing dog is found, so is a very specific shoe with blood stains. The shoe leads to the victim, who is identified as Dr. Greta Esterman. She was working on tracing the nexus of people who had the HIV virus/AIDS and evidence of her death points to possibly someone Dr. Esterman was tracking, but he's been in the hospital for 6 days. Elliott and Olivia are following several leads but soon another victim is found in the park, another older woman, similar wounds to Dr. Esterman. Is this the work of a serial killer or someone the victims know?