The mother of 15-year-old Jaheim McMillan, Black Lives Matter Grassroots and other activists are calling for a federal civil rights investigation into the Black teen’s shooting death by a Gulfport police officer. “I am so disappointed by the decision and had hope that Mississippi would do the right thing, but they do not have the courage,” Jaheim’s mother, Katrina Mateen, said in a statement released by Black Lives Matter Grassroots, a non-profit group made up of over a dozen BLM chapters. On Friday, the Mississippi and Gulfport branch of the NAACP joined the mother and activists demanding accountability from law...