Texas has seen a number of child killings by mothers in recent years.
Less than five years earlier, another Hudson Oaks family was torn apart when Dee Etta Perez, 39, shot her three children, ages 4, 9 and 10, before killing herself.
Andrea Yates drowned her five children in the family's Houston bathtub in 2001. In 2003, Deanna Laney beat her two young sons to death with stones in East Texas, and Lisa Ann Diaz drowned her daughters in a Plano bathtub. Dena Schlosser fatally severed her 10-month-old daughter's arms with a kitchen knife in 2004.
All four of those women were found innocent by reason of insanity. Yates initially was convicted of capital murder, but that verdict was overturned on appeal.
Maybe it's just something in the water...