The father accused of killing his three young daughters in River Falls is now facing a new charge. Prosecutors filed an attempted arson charge against Aaron Schaffhausen. The 35-year-old father is already facing 3 counts of 1st Degree Intentional Homicide. He is accused of killing the three girls on July 10th in the home they shared with their mother, Schaffhausen's ex-wife. Reports showed an investigator smelled gas in the basement of the home and found a gas container had been tipped over.