I'm not sure I've seen her/him on Letterman, but that's probably who you're thinking of. Here's a photo: <A HREF="http://www.nationaltheatre.org/mainstage/art/ANightWithDameEdna/DameEdnaWithClaws200h.jpg" target="_blank">http://www.nationaltheatre.org/mainstage/art/ANightWithDameEdna/DameEdnaWithClaws200h.jpg</A>