A tree fell onto the backyard pool of a Bronx residence Monday afternoon, killing one woman and leaving a second hospitalized, police said. The deadly incident occurred around 1:30 p.m. at an apartment building off Palisades Avenue in Spuyten Duyvil, the NYPD said. A thunderous crack sent the tree hurdling down toward the private pool. A 59-year-old woman, later identified…