As a federal court prepares to rule on a challenge to Sirhan Sirhan's conviction in the Robert F. Kennedy assassination, a long overlooked witness to the murder is telling her story: She heard two guns firing during the 1968 shooting and authorities altered her account of the crime. Nina Rhodes-Hughes wants the world to know that, despite what history says, Sirhan was not the only gunman firing shots when Kennedy was murdered a few feet away from her at a Los Angeles hotel. What has to come out is that there was another shooter to my right," Rhodes-Hughes said in an exclusive interview with CNN. "The truth has got to be told. No more cover-ups." The U.S. District Court in Los Angeles is set to rule on a request by the 68-year-old Sirhan that he be released, retried or granted a hearing on new evidence, including Rhodes-Hughes' firsthand account. Prosecutors under the [CA] attorney general are contending that Rhodes-Hughes heard no more than eight gunshots during the assassination. Sirhan's lawyers are challenging those assertions. In a response also filed in federal court in Los Angeles, the defense team led by New York attorney William Pepper contends that the FBI misrepresented Rhodes-Hughes' eyewitness account and that she actually had heard a total of 12 to 14 shots fired.