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U.S. Marshals Service, File, Associated Press
FILE - This undated file photo provided by the U.S. Marshals Service shows Catherine Greig, the longtime girlfriend of Whitey Bulger, who was captured with Bulger, June 22, 2011, in Santa Monica, Calif. Prosecutors will ask a federal judge to sentence the longtime girlfriend of Boston gangster James "Whitey" Bulger to three more years in prison for refusing to testify about whether anyone else helped Bulger after he fled the city. Greig is scheduled to be sentenced Thursday, April 28, 2016, after pleading guilty to a criminal contempt charge for refusing to testify before a grand jury.

BOSTON — Prosecutors will ask a judge to sentence the longtime girlfriend of Boston gangster James "Whitey" Bulger to three more years in prison for refusing to testify about whether anyone else helped Bulger after he fled the city.

Catherine Greig already is serving an 8-year sentence for helping Bulger while he was a fugitive. Greig spent 16 years on the run with him before they were captured in Santa Monica, California, in 2011.

Greig is scheduled to be sentenced Thursday after pleading guilty to a criminal contempt charge for refusing to testify before a grand jury.

Greig's lawyer, Kevin Reddington, said the 65-year-old Greig should get no more than six months added to her prison time.

"It is obvious that she is a kind, gentle woman who has literally done nothing bad in her life except fall in love with James Bulger and live with him for 16 years until their arrest," he wrote in a sentencing memo.

Prosecutors said Greig refused to answer questions before the grand jury even after she was given immunity and after a judge issued an order compelling her to testify. They argued in a sentencing memo that she should be sentenced to a little more than three years "for her conscious, considered, and unapologetic violation of the law."

Greig already had nine months added to her prison time after she was found in civil contempt for refusing to testify before the grand jury.

Bulger, now 86, is serving a life sentence after being convicted in 2013 for playing a role in 11 murders.