The Cook County state’s attorney’s office on Tuesday asked judges to vacate eight murder convictions connected to a retired Chicago police detective accused of framing others who were sent to prison.State’s Attorney Kim Foxx told reporters that her office no longer will oppose post-conviction litigation in eight cases following a 2019 review of cases related to allegations of police misconduct involving Reynaldo Guevara.“We no longer believe in the validity of these convictions or the credibility of …