If the victims shared a sperm donor father, then they were technically half sisters. His mother had worked at the clinic where these women had received in vitro fertilization—had she known about the treatments? And if these victims were related through a sperm donation, could Darlene have been a product of the donor, as well? If so, did his father know? “This puts a new spin on the case,” Special Agent Norton said. “We need to explore that research facility and anyone with a medical background. I’ll get someone to check out all the employees.” “And you need to find a list of all those women who received donations from that sperm donor,” Grady said. “Check to see if my half sister was one of the offspring.” Norton nodded. “Warn the agents to tread lightly here,” Special Agent Adams advised her colleague. “Some of the parents may not be aware they received this donation. It’s possible the women were duped into thinking they were receiving their husband’s sperm, and that the husbands have no idea their offspring aren’t their biological children.”
