"In this Sept. 17, 2008 file photo, John Martorano is questioned about his plea agreement in exchange for testifying against former FBI agent John Connolly, in the Miami Courthouse. Connolly is accused of helping the Boston mob murder Miami gambling executive John Callahan in 1982, at Miami International Airport. Martorano, who served 12 years in prison after a plea deal, and who has admitted killing 20 people, is expected to testify at the trial of James ""Whitey"" Bulger, Monday, June 17, 2013 in federal court in Boston. (AP Photo/Marice Cohn Band, Pool, File)"