The victim of a fatal shooting in Roslindale Saturday night has been identified as Nelson Castillo, 25, of Boston, police said. Castillo was killed in one of four shootings in Boston Saturday. In the other three, one man was critically wounded, and six people were injured. A ninth person was shot late Sunday afternoon in Franklin Park and is expected to survive. The Roslindale fatal shooting occurred prior to 11:48 p.m., when officers found Castillo in a parking lot on Archdale Road, suffering from several gunshot wounds, police said. He was pronounced dead at the scene.