Ken Curtis Was an American Actor and Singer Who Gained Popularity for His Role as Festus Haggen in the Long-Running Television Series “Gunsmoke. ” with a Career Spanning over Six Decades, Curtis Left an Indelible Mark in the Entertainment Industry. Sadly, Curtis Passed Away on April 28, 2013, at the Age of 74. at the Time of His Death, His Net Worth Was Estimated to Be $5 Million. Let’s Delve into the Life and Achievements of This Iconic Actor, Along with Some Interesting Facts About Him.