FILE - Demonstrators held a vigil at Foley Square in New York City to call for justice for Quawan Charles on November 13, 2020. (Karla Ann Cote/NurPhoto via Getty Images)NEW IBERIA, La. - A Louisiana sheriff said Saturday that his office is “working hard to ensure no stone is left unturned” in determining what led to the death of a Black 15-year-old whose disappearance sparked speculation about racial crime.“I want to assure the public that I, and my team, are doing everything we can, and following every lead, to gather evidence into what happened in the untimely death of Quawan ”Bobby" Charles," Iberia Parish Sheriff Tommy Romero said in a news release.“Any loss of life is a tragedy and that is especially true when it is a young person..