The cover page of part of the FBI's file on entertainer Michael Jackson detailing a request to open a case against him is seen in this photograph released to Reuters December 22, 2009. The FBI on Tuesday released hundreds of previously sealed documents related to Michael Jackson, most of them detailing a 1992 investigation of a man who threatened to kill the pop star and then-U.S. President George H.W. Bush. REUTERS/Handout (UNITED STATES - Tags: ENTERTAINMENT CRIME LAW) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS