The little ghosts made of bunched white cloth danced and dangled from the branches along Colony Street in Fairfield, life breathed into them by a brisk fall breeze on this sullen Friday afternoon. Leaves swirled around the trappings of Halloween, the carved pumpkins, the decorations of black cats with arched backs, all declaring this neighborhood as kids' territory. At one end of the street a tall wooden barrier muffles the hum and rumble of I-95, the Sullivan-McKinney Elder Housing complex at the other. It is a tidy street of bungalow, Colonial, cape and ranch-style homes, an unlikely setting for the horrible violence that exploded there in August, when a 29-year-old lawyer broke into the home next door, knocked down his 59-year-old neighbor and stabbed him multiple times....