Alberto Carvalho says 'code of silence' must end after another teen killed

Miami-Dade County Public Schools Superintendent Alberto Carvalho spent Thursday consoling students at the high school where a 15-year-old boy who was shot to death was a freshman football player.Miami Northwestern Senior High School freshman Johnny Lubin was fatally shot Wednesday afternoon as he walked home from school in his Liberty City neighborhood."Seven shootings impacting kids from Northwestern in six months is too much," Carvalho said. "It is unacceptable. We feel anguish, disappointment