'Whitey' Bulger killed with a 'lock-in-the-sock,' mafia hitman eyed, officials say

'Whitey' Bulger killed with a 'lock-in-the-sock,' mafia hitman eyed, officials say  NBCNews.com Whitey Bulger's attackers tried to cut out his tongue, federal official says  CNN Old Mass. grudge may have been factor in Bulger's slaying  The Boston Globe Howie Carr: Something to chew on for suspect in Whitey Bulger's slaying  Boston Herald Prison Where Whitey Bulger Died Is Known As One Of The Most Dangerous In America  HuffPostFull coverage