Mary B. Yates (b. 1964)

Andrea Pia Yates is an American woman from Houston, Texas, who confessed to drowning her five children in their bathtub on June 20, 2001. The case of Yates—who had exhibited severe postpartum depression, postpartum psychosis, and schizophrenia in the years leading up to the murders—placed the M'Naghten rules, along with the irresistible impulse test for sanity, under close public scrutiny in the United States.