PHILADELPHIA — Authorities have arrested a person suspected of arson in connection with a fire and building collapse that killed a 27-year veteran of the Philadelphia Fire Department, officials announced Tuesday. The charges come a day after hundreds gathered at a funeral in South Philadelphia to mourn the death of Lt. Sean Williamson, 51, who died after a fire-damaged pizza shop collapsed on firefighters in the early hours of June 18. The name of the suspect was not immediately available. Charges are expected to come down in Philadelphia’s federal court following a 10-day investigation betwee…
