Which UFC champion tested positive for steroids?

The California State Athletic Commission stated that UFC Lightweight Champion Sean Sherk tested positive for the banned substance Nandrolone Metabolite and that lightweight contender Hermes Franca tested positive for Drostanolone. Reference was from: http://www.ufc.com/index.cfm?fa=news.detail&gid=6848 At UFC 44 Tim Sylvia tested positive for steroids during a mandatory post-fight drug test. Due to this, he was stripped of his UFC Heavyweight Title.