Dorothy Rost Sieber, 89, of Greenock, died Sunday September 2, 2012. Visitation will be held Wednesday September 5 from 1-3 and 6-8 pm. at the GILBERT FUNERAL HOME AND CREMATORY, INC. Service will be held on Thursday September 6 at 12 noon in the funeral home chapel. Interment will follow in Ligonier Valley Cemetery, Ligonier. In lieu of flowers, memorial contributions may be made to the Alzheimer's Association 1100 Liberty Ave. Ste-E-201 Pittsburgh PA 15222 or call 412-261-5040.