KNOXVILLE, Iowa (AP) — An Iowa man acquitted of killing his mother is suing the state, its public safety department and a criminal investigator. The Des Moines Register reports that 47-year-old Jason Carter claims in the petition filed Thursday in Marion County that a state investigator spread false information about him while handling the June 2015 death of 68-year-old Shirley Carter to turn his family against him. He also alleges that the investigator ignored evidence clearing his name. A spokeswoman with the public safety department declined to comment Friday, citing ongoing litigation.