No one knows exactly how big the fragment was, but it blew a hole the size of a football through the windshield. It struck Jo Maureen Fisher in the head, sailed between her preschoolers, hit the rear window and shattered it too, flying out of the truck's cab never to be found. Wounded in the most random of ways, John Fisher's 33-year-old wife died the next day. Today, he is a single dad trying to balance work with child care and all the things she used to do.