Mary Sheila Slattery On Saturday, September 10, 2011, of Ellicott City, MD. Beloved mother of Daniel (Valerie), James (Tricia), and Michael Slattery, and sister of Daniel. O'Donnell. She is also survived by two grandchildren, James and Kyle, and many loving relatives and friends. Family will receive friends at the family owned Beall Funeral Home, 6512 NW Crain Hwy (Rt. 3 South), Bowie, MD on Thursday, September 15 2011 from 5 to 8 pm. A Mass of Christian Burial will be celebrated at Sacred Heart Chapel, 16501 Annapolis Road, Bowie, MD on Friday, September 16, 2011 at 11 am. Interment in Mount Olivet Cemetery in Washington DC to follow.