TAMPA - When police responded to a call from a concerned relative and found Julie Schenecker on the back porch of her Tampa home, they said she was covered in blood and made a gut-wrenching admission: She had killed her teenage son and daughter because they were "mouthy." .art_main_pic { width: 250px; float: left; clear: left; } Police said the military officer's wife, described by her mother as depressed, shot and killed her son on the way to soccer practice,...