O'Keefe, William David of Arlington. March 13th. Loving son of the Late Timothy W and Margaret O'Keefe. Brother of the late Ann T Mahon and brother in law to the late James Mahon. Loving Uncle to Patti Rivers, Kevin Mahon, Kathy Francioso, Karen Bartlett, David Mahon, Richard Mahon and the late Tommy Mahon. Loving Great Uncle to Timmy and Kelly Rivers, Jen Simard and Maggie Bartlett, Kendra and Alison Mahon, Colleen and Meghan Francioso, and Shannon and Erin Mahon. William proudly served his country in the Korean War. He was long time employee of the Town of Arlington. Relatives and friends are invited to visit in the DeVito Funeral Home 1145 Mass., Ave., ARLINGTON on Monday March 20th from 8:30 - 9:30 am and to a funeral mass at 10:00 am in St. Agnes Church. Burial to follow in Mt. Pleasant Cemetery. For directions or to send a condolence visit, devitofh.com.