The incident occurred at a six-story brick building on Oak Terrace just after 6 p.m. Friday.
Police say the victim lives on the block and was a fixture at church and volunteered at the food pantry there for many years.
Among the victims is a 68-year-old man from Pennsylvania who was in town visiting for an NYPD memorial.
City health officials have confirmed the first death in connection to the ongoing Legionnaires' disease outbreak on the Upper East Side.
Watch parties are happening across New York City and the Tri-State for the World Cup final on Sunday afternoon.