SPRINGFIELD — A woman found guilty of a McHenry County murder had her conviction vacated last week after serving 19 years of her 27-year sentence and maintaining her innocence throughout her imprisonment.With the help of the lawyers from the Illinois Innocence Project, Jennifer McMullan was released from prison June 16 as a result of a plea agreement entered in McHenry County court.McHenry County State’s Attorney Patrick Kenneally’s plea deal to grant McMullan’s release and vacate her murder conviction depended on if she …