PHILADELPHIA — A 51-year-old Philadelphia firefighter was killed in an early-morning building collapse Saturday that has devastated the Fire Department and left a neighborhood shaken. Two other firefighters were hospitalized in critical but stable condition. City officials said that 27-year veteran Lt. Sean Williamson was killed after he was trapped in the rubble along with other firefighters. In all, four firefighters and a Department of Licenses and Inspections inspector suffered injuries. The collapse in the city’s Fairhill section followed a fire at a popular pizza shop that evidently had …
