The allegations that the Brooklyn district attorney announced in June were shocking: Four men were accused of abusing a young woman for a decade, raping her and forcing her to have sex with others beginning when she was 13.

But this week, the office made another disturbing announcement that upended part of a case that had already drawn notice for its twists and turns. Shortly after she made her accusation, the woman recanted her allegation against one of the men in an interview with detectives, a fact that was not shared with defense lawyers for nearly a year.

That defendant, Darrell Dula, 25, was immediately released on Tuesday after 10 months in custody. Although the district attorney’s office said it planned to continue the prosecution of all four defendants on charges including rape, sex trafficking and compelling prostitution, the surfacing of the police report will probably lead the authorities to drop all charges against Mr. Dula, officials familiar with the case said. He was charged with rape.

The recantation was reported on Tuesday by The New York Daily News. The paper quoted a detective in the police report as saying: “I once again asked [her] if she was raped. She told me ‘no’ and stated to me, ‘Can’t a ho change her ways?’ ”