Protestors call for justice as Birk resigns from force

Seattle Police stand down protestors who marched to within a block of a precinct station in Seattle's Capitol Hill neighborhood during a night-time protest march against Seattle Police Officer Ian Birk, Wednesday, Feb. 16, 2011. Birk, who fatally shot John T. Williams on a downtown street last year, resigned Wednesday, after the King County prosecutor said earlier in the day that no charges would be filed against him. (AP Photo/Ted S. Warren)