What's the history of the case?
But the 2017 book "The Blood of Emmett Till", by Timothy B. Tyson, quotes a white woman, Carolyn Donham, as acknowledging during a 2008 interview that she wasn't truthful when she testified that Till grabbed her, whistled and made sexual advances at a MS store in 1955.
The woman - Carolyn Bryant - reportedly told her husband and brother that Emmett had groped her, made crude remarks, and wolf-whistled at Carolyn.
Till was later abducted from the home he was staying at for the summer and was beaten and shot.
Despite the pleas of his MS family, Roy Bryant and Milam reportedly forced Emmett into their waiting vehicle and drove him down to the Tallahatchie River, where they reportedly forced the teen to carry a 75-pound cotton gin fan.
Later, Roy Bryant and Milam told a magazine how they killed Emmett and dumped his body in the Tallahatchie, but because of double jeopardy laws, they couldn't be tried again.
The only identifying item on Emmett's body was an monogrammed ring. His mother, Mamie Till, left her son's casket open for the funeral, to show people how insane racism had gotten in the south.
Four days later, on August 28, 1955, Roy Bryant and his half-brother, J.W. Milam, rousted Emmett from his bed in the middle of the night, ordered him into the bed of a pickup and eventually beat him viciously before shooting him in the head.
Last year, Vanity Fair published an article in which author and Duke University scholar Timothy Tyson said Carolyn Bryant - by then, Carolyn Bryant Donham - confessed she made up the most damning part of her story. They both admitted to the murder in an interview with Look, but were never retried. The case was closed in 2007 with authorities saying the suspects were dead; a state grand jury didn't file any new charges.
The Justice Department told Congress in a March report that the case would be reopened based on "new information", although a cousin of the slain teen said she was not aware of the development until she was contacted by reporters, reported the Associated Press. The report added that "b$3 ecause the matter is ongoing, the Department can provide no further information about the current investigation".
District Attorney Dewayne Richardson declined comment Thursday on any role he might have in the case.
Ms Bryant also said he told her "you don't need to be afraid of me", alleging he used an obscenity and mentioning something he had done "with white women before".