BOSTON — Prosecutors are trying to seize assets of mobster James “Whitey” Bulger’s girlfriend.

They’ve asked a judge to order a garnishment of assets belonging to Catherine Greig held by Eastern Bank.

Federal prosecutors say in court filings that they believe Greig “holds significant assets and/or funds.”

Greig pleaded guilty last week to helping Bulger evade authorities for more than 16 years. Bulger has pleaded not guilty to participating in 19 murders. The couple was captured last summer in Santa Monica, Calif.

Assistant U.S. Attorney Christopher Donato says he believes there’s a strong likelihood Greig will be ordered to pay a fine when she’s sentenced in June. He asks a judge to order any Greig asset held by Eastern Bank to be paid to the government.