An Arizona mom allegedly murdered her two young children by locking them in a car for over 14 hours and then blaming an unidentified babysitter for their deaths. Nancy Grace looks at the case against Brittany Velasquez with a panel of experts including DNA expert George Schiro, psychotherapist Lauren Howard, Atlanta juvenile judge Ashley Willcott, and reporter Larry Meagher. Reporter Chuck Roberts joins Nancy to update the case against a woman accused of dressing up as a clown to kill her lover's wife.