The girlfriend of notorious mobster James "Whitey" Bulger was set to plead guilty to three charges Wednesday, including conspiracy to harbor a fugitive.

Catherine Greig, 60, was due to appear in a Boston federal court over allegations she helped Bulger evade capture for 16 years, Fox affiliate WFXT-TV reported.

Greig's lawyers arranged the change in plea Monday after additional charges were filed against her for identity fraud.

By pleading guilty, Greig will avoid going to trial and will not be forced to testify against 82-year-old Bulger, who is accused of committing 19 murders in Boston dating back to the 1970s.

Each charge against Greig carries a maximum sentence of five years, but she could serve just 32 months in prison under federal sentencing guidelines as she has no prior convictions, according to the station. 

Some of the murder victims' family members expressed their disappointment at hearing the news.

Tom Donahue told The Boston Globe earlier this week, "She helped that guy on the run." His father, Michael Donahue, was killed in 1982 when he gave a ride to a man Bulger allegedly intended to murder.

"We could have had these answers 16 years ago. She's a criminal, she's not a victim. She's a criminal," he added.

Greig and Bulger, 82, were arrested in Santa Monica, Calif., last June after nearly 17 years on the run. They went into hiding in 1994 after Bulger discovered he was to be arrested.

Newscore contributed to this report. 

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Accused Boston mobster's girlfriend set to plead: MyFoxBOSTON.com