Searxng/Ralph Gunderman Celebrity Voice actor Ralph Gunderman, known for Dateline and David Letterman sketches, dies at 77 from pneumonia complications. April 26, 2026 AceShowbiz - Ralph Gunderman, the warm-voiced artist known for his longtime work as the announcer on NBC's Dateline and as a contributor to comedy sketches on Late Show With David Letterman, has passed away at 77. Ralph Gunderman died on March 1 at Lenox Hill Hospital in New York due to complications from pneumonia, a family spokesperson confirmed.