http://worldblog.msnbc.msn.com/archive/2009/02/06/1784743.aspxA Nazi hunter questions the mysterious disappearance of Aribert Heim, better known as "Dr. Death," the mastermind behind some of the most sadistic crimes in Nazi concentration camps. Watch NBC News' Martin Fletcher report in conjunction with the Newen-USCommunityServer 2.0 (Build: 60608.1)