A former prosecutor who helped lead the government’s case against the man accused of killing congressional intern Chandra Levy opposed a temporary suspension of her law license over claims she withheld evidence from the defense team before the 2010 trial.

The District of Columbia Office of Disciplinary Counsel charged Amanda Haines, a former U.S. assistant attorney, with violating ethics rules by failing to provide the man who was convicted of killing Levy, Ingmar Guandique, with part of a letter that could have been used by the defense to discredit a key witness in the trial. Guandique was found guilty by a jury, but he was later granted a new trial and the government dropped the charges against him.