Overview

• Fotios Geas, Paul DeCologero, and Sean McKinnon reached plea deals with federal prosecutors.
• Bulger was attacked with a padlock wrapped in a sock, resulting in fatal head injuries.
• The Justice Department's inspector general cited management failures and flawed policies in Bulger's death.
• Bulger, 89, was a former FBI informant and leader of Boston's Winter Hill Gang.
• The plea deals come nearly six years after the high-profile prison killing.