LOS ANGELES — Roman Polanski’s attorney has asked a Los Angeles judge to unseal testimony given by a former prosecutor who handled the fugitive director’s long-running sexual assault case.

Harland Braun wrote a letter filed Feb. 10 seeking to unseal testimony given in 2010 by a former prosecutor handling Polanski’s case. Braun’s letter says the testimony is crucial to trying to resolve Polanski’s case.

Polanski pleaded guilty to unlawful sexual intercourse with a 13-year-old girl and fled the U.S. in 1978 on the eve of sentencing. He has said he was mistreated by a judge and prosecutors.