Age 67, of Dormont, on Monday, January 26, 2015. Beloved companion and wife of Keith L. Lau; daughter of the late Pio DiPofi and Dorothy Wilson DiPofi; loving mother of Richard, Gerald (Renee), Keith D. (Jennifer), and Shawn (Debbie) Lau; sister of Jackie (late David) Sipe, Pio (Karen) DiPofi, Darlene (Wayne) Falgiani, Michele (Ron) Conley, and Dino DiPofi; and grandmother of Lacey, Lindsay, Ashley, Haley, Jacob, Justin, Sadie, Koral, and Jason; beloved aunt to many nieces and nephews, and many great-nieces and nephews; and many aunts, uncles, cousins, and in-laws. Friends welcome Thursday 2-9 p.m., WILLIAM SLATER II FUNERAL SERVICE, (412-563-2800), 1650 Greentree Rd., Scott Twp. Mass of Christian Burial Friday 11:30 a.m., St. Catherine of Siena Church, 1810 Belasco Ave., Pgh., PA 15216. EVERYONE PLEASE MEET AT CHURCH. Burial in the National Cemetery of the Alleghenies, Bridgeville, PA. In lieu of flowers may be made to the American Cancer Society , 320 Bilmar Dr., Pittsburgh, PA 15205. - See more at: http://www.legacy.com/obituaries/postgazette/obituary.aspx?n=ruth-diane-lau&pid=173992055&fhid=4269#sthash.bNhpUlbl.dpuf