Karen K. Greenberg, along with co-authors Daniel Pollack, Ellen Crane, and Khaya Eisenberg, recently published an abstract on ResearchGate that delves into the infrequently occurring crimes of infanticide, parricide, and filicide committed by adoptive parents and children. The title of their study is, “A unique killing: Adoptive parents who kill their adopted children; adopted children who kill their adoptive parents.