A 31-year-old woman who spent eight years in prison was acquitted of her first-degree murder charge at a second trial last week.In 2011, Kerry Masterson was found guilty of the 2009 shooting death of Michael Norton, who owned Norton’s Sweet Shop in the Austin neighborhood.Andrea Lewis, one of the attorneys who represented Masterson for Northwestern Pritzker School of Law’s Center on Wrongful Convictions, said she …