Authorities in Waushara County have identified the driver who hit and killed a six-year-old girl waiting for a school bus Monday morning.  Witnesses say 76-year-old Carl Mullenix was driving his pickup on the road’s shoulder on the right side of the bus when he struck the victim and her four-year-old sister.  The victim’s name isn’t being released due to her age.  The younger girl was treated at a hospital and has returned home.  The school bus was stopped at the time with its flashing lights activated.