 Comedic actor Martin Mull has died at the age of 80. On television, Mull was probably best known for playing Roseanne Conner's gay boss, Leon Karp, in the sitcom Roseanne. You just think about it, young lady. I hate to shop. I am absolutely insensitive. I detest Barbra Streisand. And for God's sake, I'm a Republican. But do you like having sex with men? Well, it's gay!