In this Sept. 15, 2014 file photo, then-Washington Mayor Vincent Gray arrives on Capitol Hill in Washington. Federal prosecutors have ended their investigation of Gray after nearly five years. The long-running probe exposed an illegal slush fund that helped Gray get elected in 2010. Six people who were involved in the campaign have pleaded guilty to felonies. But prosecutors were never able to establish that Gray committed a crime or knowingly conspired with his advisers. D.C. Council member and former mayor Mr. Gray said Thursday that he has early-stage dementia and will no longer vote "on legislation or other matters" as his term winds down. (AP Photo/J. Scott Applewhite, File)
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