TALLAHASSEE — State Sen. Gary Siplin and a coalition of other black lawmakers are asking Gov. Rick Scott to appoint a special prosecutor to investigate last month's shooting death of an unarmed black teenager by a neighborhood watch volunteer near Orlando. Trayvon Martin, 17, who was black, was killed Feb. 26 by George Zimmerman, a 28-year-old white Hispanic, in a gated community in Sanford. Zimmerman, who has not been charged, has said he shot the high school student in self-defense. The shooting, now being investigated by the U.S. Department of Justice and local authorities, has sparked an international furor with...