A state appeals court has upheld the conviction and sentence of a former North Fond du lac man for child sex assault. Thirty three year old Jonathan Gurath is spending more than 30 years in prison for multiple counts including sexually assaulting a 13 year old girl. Gurath appealed his 25-year sentence on the sexual assault count. The circuit court denied the motion. On Wednesday, the 2nd District Court of Appeals upheld the circuit court ruling.