“I . . . what?” Sam frowned, trying to understand what Sanchez had just told her. “What are you saying? The Butcher killed PJ? Why would he do that?” “No, he didn’t kill PJ,” the detective said. “I didn’t say it was an exact match. But there is family relationship between whoever killed PJ and whoever killed Bonnie/Joyce. The lab tech discovered it by accident—he thought he’d mixed the samples up. Turns out both sets of DNA share certain markers that prove they’re father and son. The father killed Bonnie/Joyce. The son killed PJ Wu.”
