Marty Walsh March 23, 2021 1:20 pm Marty Walsh Heading to Washington He officially resigned as mayor at 9 p.m., when City Council President Kim Janey became acting mayor. US & World Videos 2:09 President of MIT calls for shutting down pro-Palestinian encampments 1:00 Three dead in apparent murder-suicide in Lowell 3:05 100 protesters detained at Northeastern University 2:39 Community mourns police sergeant killed on duty 2:50 Community mourns Billerica police sergeant killed on duty