( CNN ) -- The longtime companion of notorious fugitive James `` Whitey '' Bulger pleaded not guilty in Boston Thursday to charges she harbored and concealed him , said a spokeswoman for the U.S. Attorney for the District of Massachusetts . Catherine E. Greig , 60 , who is being held without bail , allegedly assisted Bulger from January 1995 until June , when the pair was arrested in California , the U.S. Attorney 's Office said in a statement last week . `` It is alleged that Greig conspired to take steps to prevent Bulger 's discovery and arrest , after knowledge of the fact that a warrant had been issued for his apprehension , '' the office said . Greig 's attorney , Kevin Reddington , did not immediately return calls for comment Thursday . According to the indictment , Greig and Bulger posed as a married couple under different false identities and claimed to be from states other than Massachusetts . She would shop and handle bills so that Bulger would `` minimize his time in public , '' it asserts . Government prosecutors last month released a series of photographs showing cash , weapons and even a grenade recovered from the Santa Monica , California , apartment where Bulger and Greig apparently lived for 15 years while he was being hunted by the FBI . If convicted of the charges against her , Greig could be sentenced to five years in prison , three years of supervised release and a $ 250,000 fine , according to the U.S. Attorney 's office . Bulger has pleaded not guilty to all counts against him , including his alleged role in 19 murders . Prosecutors say Bulger was the head of a South Boston Irish gang before he fled an impending racketeering indictment in 1995 . CNN 's Katie Silver contributed to this report .
Greig allegedly helped frame Bulger for two years . The couple was arrested in Boston in June . Bulger is suspected in 19 murders .