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Castucci said she did not know before her husband's death that he was a member of the Patriarca group.
Bulger's lawyers have challenged the credibility of three former Bulger associates who have agreed to testify against him, including Martorano, who spent three days on the witness stand. Flemmi and former Bulger lieutenant Kevin Weeks are also expected to testify.
James Marra, a special agent with the Justice Department's Office of the Attorney General, also spent hours on the witness stand testifying for prosecutors Monday and Tuesday by reviewing reports in a 700-page FBI file on Bulger's alleged role as an informant.
Bulger's lawyers deny that Bulger was ever an FBI informant.
Marra said that based on documents in the file, Bulger was an informant from 1975 until 1990, providing information on the rival New England Mafia as well as other criminals in the Boston area.
Under cross-examination by Bulger attorney Hank Brennan on Tuesday, Marra acknowledged that former FBI agents John Connolly and John Morris both failed to include descriptions of their own wrongdoing in the reports they put in Bulger's file.
"They weren't reporting their own criminal activity," Marra said.
Connolly was convicted of crimes accusing him of tipping off Bulger and other gang members to an upcoming indictment, prompting Bulger to flee. Morris, who received immunity, admitted accepting cash from Bulger. Morris is expected to testify Wednesday.