The California State Athletic Commission has suspended Cristiane Justino Santos, the Strikeforce women’s featherweight champion.

Better known as “Cyborg,” the fighter tested positive for the anabolic steroid Stanozolol, also known as Winstrol.

The positive test was from a sample taken a day before Santos knocked out the top contender for the title, Japan’s Hiroko Yamanaka, on December 17, 2011 in just 16 seconds.