Erin Kathleen Ernst, Aug. 14, 2012, age 17, cherished daughter of Kathleen, nee Ruane and Michael C.C. S.P. Ernst; loving sister of Margaret "Maggie" and Annie Ernst; beloved granddaughter of Lester (Lorraine) Ruane, Richard (late Clare) Myers, and the late Mary Clare Ruane. Erin is also survived by many aunts, uncles, cousins, and many dear friends. Erin was a member of the National Honor Society and the Lemont Police Department Cadet Program. Funeral services Saturday, 8:45 a.m. at the Petkus Lemont Funeral Home, 12401 S. Archer Ave., (at Derby Rd.), Lemont. To St. Alphonsus Church for Mass of Christian Burial at 9:30 a.m. Interment Ss. Cyril & Methodius Cemetery. In lieu of flowers, Memorial offerings in Erin's name may be made to the Lemont Police Department's Cadet Program, 14600 127th St., Lemont, IL 60439. -