Federal prosecutors are asking a judge to sentence gangster James ``Whitey'' Bulger to two consecutive life sentences, plus five years, saying he is ``one of the most violent and despicable criminals in Boston history.''

Prosecutors made their recommendation in a sentencing memo filed in court Thursday. They argue that Bulger has ``no redeeming qualities'' and ``deserves no mercy.''

They are also asking that the judge order Bulger to pay restitution to the families of 19 murder victims, even though the jury convicted him in only 11 of the killings.

The 84-year-old Bulger _ the former leader of the Winter Hill Gang _ was convicted in August after spending nearly 17 years on the run.

Bulger's lawyers have not yet made their recommendation. Sentencing is set for next week. (Associated Press)