R. Lee Ermey

Ronald Lee Ermey (March 24, 1944 - April 15, 2018) was an American film, television, and voice actor and former USA Marine Corps drill instructor, best known for playing military figures. He voiced Leslie Hapablap in the season 7 episode "Sideshow Bob's Last Gleaming" and the season 26 episode "Waiting for Duffman".

After his death, the season 29 episode "Lisa Gets the Blues" was dedicated to him.