Thanks, all of you, interesting comments and Wolfgang, I will take advantage of the blue clicky you provided.
No doubt today's rapid communications allow us to hear of such things much faster.
I think that a mother or father who takes the life of a child must be insane. One troubling aspect of the Houston situation (to me at least)is the mother chasing down the older child when he resisted her, putting him in the bathtub and drowning him. She had plenty of time to reflect on what she was doing if she was capable of thinking at all.