19-year-old David Diaz (pictured here with his former girlfriend) recently moved from Harlem to the Bronx, but on the last night of his life he was palling around with friends in his old neighborhood, tossing eggs off a roof on West 135th Street. When one of their targets headed up on the roof to confront the teens—wielding a knife according to one report—the youths scattered. The Daily News says that Diaz, his right arm in......