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This undated file photo filed July 31, 2013 in federal court documents in Boston by defense attorneys for James "Whitey" Bulger, shows Bulger in an unknown location in Boston. Bulger was convicted Monday, Aug. 12, 2013 in a string of 11 killings and other gangland crimes, many of them committed while he was said to be an FBI informant. (AP Photo/Federal Court Documents) ( Whitey Bulger )

This 1986 file photo provided by the FBI shows James "Whitey" Bulger. (AP Photo/FBI, file) ( Whitey Bulger )

This combination of 1984 file photos provided by the FBI shows James "Whitey" Bulger. (AP Photo/FBI, File) ( Whitey Bulger )

This June 23, 2011 booking file photo provided by the U.S. Marshals Service shows James "Whitey" Bulger, who fled Boston in 1994 and was captured 2011 in Santa Monica, Calif., after 16 years on the run. (AP Photo/ U.S. Marshals Service, File) ( Whitey Bulger )

This 2011 United States Marshals Service mug shot shows former organized crime figure, suspect James "Whitey Bulger. AFP PHOTO / US MARSHALS SERVICE == HO/AFP/Getty Images ( 521832553 )

Steven Davis, brother of Debra Davis, speaks to reporters outside the John Joseph Moakley United Sates Courthouse following a guilty verdict against James "Whitey" Bulger August 12, 2013 in Boston, Massachusetts. Bulger was found guilty on 31 of 32 counts of racketeering and acts related to murder. Bulger was convicted of the Michael Donahue murder while Debra Davis was the one murder that was found as "No Finding." (Photo by Darren McCollester/Getty Images) ( 176422070 )

Steven Davis, left, brother of Debra Davis, is comforted after speaking outside federal court where a jury found James "Whitey" Bulger guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013 in Boston. Jurors could not agree whether Bulger was involved in Debra Davis' killing. (AP Photo/Josh Reynolds) ( Whitey Bulger )

Patricia Donahue, wife of Michael Donahue, speaks to reporters as Steven Davis (L), brother of Debra Davis, walk by in background outside the John Joseph Moakley United Sates Courthouse following a guilty verdict against James "Whitey" Bulger August 12, 2013 in Boston, Massachusetts. Bulger was found guilty on 31 of 32 counts of racketeering and acts related to murder. Bulger was convicted of the Michael Donahue murder while Debra Davis was the one murder that was found as "No Finding." (Photo by Darren McCollester/Getty Images) ( 176422067 )

Tommy Donohue (R), son of murder victim Michael Donahue, shakes hands with defense lawyers J.W. Carney (L) and Hank Brennan, while holding his godson Alex, after speaking to reporters outside the John Joseph Moakley United Sates Courthouse following a guilty verdict against James "Whitey" Bulger August 12, 2013 in Boston, Massachusetts. Bulger was found guilty on 31 of 32 counts of racketeering acts related to murder. (Photo by Darren McCollester/Getty Images) ( 176422071 )

Thomas Donahue, son of Michael Donahue, speaks outside federal court in Boston where a jury found James "Whitey" Bulger guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013. Jurors found prosecutors proved Bulger was involved in the killings of Donahue and 10 others. (AP Photo/Josh Reynolds) ( Whitey Bulger )

Defense attorney J.W. Carney, left, speaks beside co-counsel Hank Brennan outside federal court Monday, Aug. 12, 2013, where a jury found their client, James "Whitey" Bulger, guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013 in Boston. (AP Photo/Josh Reynolds) ( Whitey Bulger )

Steven Davis, brother of Debra Davis, speaks outside federal court where a jury found James "Whitey" Bulger guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013 in Boston. Jurors could not agree whether Bulger was involved in Debra Davis' killing. (AP Photo/Josh Reynolds) ( Whitey Bulger )

Pat Donahue, widow of Michael Donahue, speaks outside federal court in Boston, where a jury found James "Whitey" Bulger guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013. Jurors found prosecutors proved Bulger was involved in the killings of Michael Donahue and 10 others. (AP Photo/Josh Reynolds) ( Whitey Bulger )

John "Jackie" Bulger, right, leaves federal court in Boston where a jury found his brother, James "Whitey" Bulger, guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013. (AP Photo/Josh Reynolds) ( Whitey Bulger )

U.S. Attorney Carmen Ortiz speaks outside federal court Monday, Aug. 12, 2013, where a jury found James "Whitey" Bulger guilty on several counts of murder, racketeering and conspiracy Monday, Aug. 12, 2013 in Boston. (AP Photo/Josh Reynolds) ( Whitey Bulger )