(Medford, OR)  --  A Oregon man is pleading guilty to cashing nearly a half-million dollars worth of Social Security checks that were intended for his Aunt, who died 50 years ago.  The Social Security Administration started the investigation, because the woman would have been the second-oldest person living in the U.S. at 114-years-old.  They learned she died in New York in 1971.  George Doumar, of Klamath Falls, admitted to cashing 458-thousand dollars worth of Social Security checks.  Under his plea deal, he'll repay the money and could be sentenced to 10 years in prison.