A lawyer says former Boston mobster James "Whitey" Bulger's longtime girlfriend plans to plead guilty to a federal contempt charge.

Catherine Greig already is serving an eight-year prison term for helping Bulger avoid capture during his 16 years on the run.

Defense attorney Kevin Reddington told a magistrate judge Monday she would plead guilty to the one-count contempt indictment. Prosecutors allege she disobeyed a judge's order to testify before a grand jury investigating whether other people helped and harbored Bulger.

Greig didn't attend the hearing. Reddington says a formal plea agreement hasn't been filed.

Bulger and Greig were living in Santa Monica, California, when they were captured in 2011.

Bulger was convicted and sentenced to life in prison. He argued he was unable to fully present his defense at trial.