Former Minneapolis police officer Derek Chauvin has filed an appeal, asking the state Court of Appeal to overturn his conviction for killing George Floyd in 2020, according to CNN . Chauvin was found guilty of unintentional second-degree murder, third-degree murder and second-degree manslaughter, and was sentenced to 22 1/2 years in prison by Hennepin County Judge Peter Cahill back in June, NPR reports.