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 2:04 Understanding the pushback against MBTA's zoning law 1:50 Boston student protesters face new warnings 2:30 Police shoot and kill armed man in Raynham, authorities say 2:02 Protesters at local campuses look on as dozens detained at Columbia 5:10 Mental health still suffers stigma in the medical and research fields