Investigators with the Green Bay Police Department are telling the court the death of a 15-month-old child last year is possibly “the worst case of child abuse” they’ve ever seen.  One police lieutenant testified the trauma leading to the girl’s death was “very disturbing.”  The medical examiner says the child had been beaten multiple times and the injuries included fractured ribs and bite marks.  Thirty-one-year-old Juan Maravilla and 30-year-old Sarah Kairys changed their stories several times while police interviewed them.  They had taken the dead girl to the hospital last year in Green Bay.