Putin's mentor in KGB dies a mysterious death; Why he was 'punished' earlier

Russian president Vladimir Putin's long-time associate who helped to usher the leader into power, has died at age 72, according to Russian media reports. Viktor Cherkesov who once served as a KGB officer in St. Petersburg had a falling out with Vladimir Putin. No cause has yet been given for Viktor Cherkesov's death by the Russian news outlet Rosbalt. Viktor Cherkesov caused controversy for an article that he wrote in the newspaper Kommersant in October 2007 in which he criticized corruption among the security services. Watch this video for more.