One night not all that long ago, a mother in Newburgh, NY, drove herself and her four children into the Hudson River. Her eldest son escaped and ran to get help, but the woman and her three younger children drowned. The tragedy brings to mind similar cases -- Susan Smith in 1994, Andrea Yates in 2001.
What leads a parent to kill their own child? Dr. Phillip Resnick, a leading expert on the subject, says there are several circumstances under which a parent might feel driven to it.