 In June 2009 , at the age of 90 , Feller was one of the starting pitchers at the inaugural Baseball Hall of Fame Classic , which replaced the Hall of Fame Game at Cooperstown , New York . Feller was treated for leukemia in August 2010 . By October , Feller was fitted with a pacemaker and was diagnosed with pneumonia and thrush , an infection of the mucous membrane lining the mouth and throat . He was transferred on December 8 from the Cleveland Clinic to hospice care . On December 15 , Feller died of complications from leukemia at 92 . 
