The northwest suburban Crystal Lake woman accused of killing her five-year-old son A.J. Freund is pleading guilty to murder.  JoAnn Cunningham will face 20 to 60 years behind bars as part of a plea deal when she is sentenced next year.  There’s no word on whether she will testify against AJ’s father and co-defendant, Andrew Freund Senior.  Prosecutors believe the young boy was beaten to death in his home and buried by his father in a shallow grave near suburban Woodstock.  Cunningham is scheduled to appear in court on January 30th.