Sandra Marie Mueller, 70, passed peacefully on Sunday, February 10, 2019. Beloved wife of David Mueller; loving mother of Mark (Jackie) Mueller and Todd (Stephanie) Mueller; devoted daughter of the late Fred and Esther Gryzwa; fond sister to Roberta (Matthew) Hosp and Ken (JoAnn) Gryzwa; loving grandmother to Tyler (10), Madelyn (5), Adla (6), Shelby (6), and Charlie (1); fond sister-in-law to Kathy and Gary Wente, and the late Charlie Mueller. Sandy is an alumnus from St. Benedict High School, a former employee with the Chicago Office of the FBI, and she spent numerous years on staff at St. Robert Bellarmine School overseeing their childcare program.  Sandy enjoyed smiles at family gatherings, quality time with her grandchildren and many memorable moments with her loving husband Dave. Visitation Friday from 3:00 p.m.-8:00 p.m. at Cooney Funeral Home located at 625 Busse Hwy in Park Ridge. Funeral Saturday, prayers at 9:15 a.m. to St. Robert Bellarmine Church for Mass at 10:00 a.m. Interment All Saints Cemetery. For information please call 847-685-1002 or visit www.cooneyfuneralhome.com