BROOKLYN - A Williamsburg woman was killed last night after fire blasted through her apartment building.Officials say the fire started in a Conselyea Street apartment at around 9:15 p.m. last night, and it took more than 100 workers to finally put out the flames. A 59-year-old woman died, and four firefighters suffered minor injuries.Investigators are still working to determine the exact cause of the fire, but a neighbor says he believes it started in the 59-year-old woman's apartment on the third floor.