San Mateo County 5 hours ago San Mateo County assistant sheriff resigns, deputies union says San Mateo County Assistant Sheriff Matthew Fox resigned Friday in the wake of calls for Sheriff Christina Corpus to step down, the deputies union confirmed. Ian Cull reports. US & World Videos 2:08 In the news: SJSU volleyball lawsuit, Bay Area radio legends, 49ers-Bills viewing party 4:04 Women-owned Marché holiday market opens this weekend in Oakland 2:09 In the news: San Mateo County sheriff, uncertain future of Macy's in SF, Warriors unveil new uniform 1:50 In the news: Deadly stabbing, airport name battle, street closure 2:11 In the news: Security camera program, Prop. K division, Lake Tahoe ski resorts