Father, 36, stabs his nine-year-old daughter to death before killing himself in murder-suicide in Illinois Police in Lake Villa, Illinois, found a nine-year-old girl and her 36-year-old father dead from murder-suicide on Thursday Officials revealed the child suffered from sharp-force wounds at the hands of her father, who then killed himself Girl's mother agreed to let her stay with her father overnight on Wednesday; the parents live separately but share custody of the child When mother learned the girl had not been in school and she could not reach the father, she asked police to perform welfare check