D.L. Coburn, the Pulitzer Prize-winning playwright whose debut play The Gin Game became an enduring work that is still widely produced, died of colon cancer on December 3 in Dallas, Texas. He was 87. Born Donald Lee Coburn on August 4, 1938 in Baltimore, Coburn did not follow a traditional path to the theater. After graduating from high school, he served in the U.S. Navy and later worked as an advertising copywriter…