Late in his career, Cosmatos received more praise for Tombstone, a 1993 Western movie about Doc Holliday and Wyatt Earp. This film was particularly praised for the exceptional performance of Val Kilmer as Doc Holliday. After his death it was revealed by Tombstone star Kurt Russell that Cosmatos had ghost-directed the movie on Russell's behalf. Sylvester Stallone recommended Cosmatos after the departure of the first director, and informed Russell that Cosmatos had also ghost-directed Rambo: First Blood Part II on Stallone's behalf.
George P. Cosmatos died of lung cancer on April 19, 2005 at the age of 64.
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