A Knoxville man acquitted of killing his mother is suing the state, its public safety department and a criminal investigator.  47-year-old Jason Carter claims in a petition filed Thursday (6/11) 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. Jason Carter also alleges that the investigator ignored evidence clearing his name. A spokeswoman with the public safety department has declined to comment, citing ongoing litigation.