Frank Shamrock retires from American mixed martial arts (MMA) fighting

Frank Shamrock (Frank Alisio Juarez III) announced he's retiring from American mixed martial arts (MMA) fighting at at Strikeforce: Fedor vs. Werdum Saturday at HP Pavilion.

Frank Shamrock is the four-time defending, undefeated MMA champion and a 7th degree black belt in something called "Submission Fighting," which is a type of wrestling sport.

Shamrock's four time title defense included some memorably brutal battles, like the one against Igor Zinoviev in 1998 that ended in a knockout. It was called the most violent slam in Ultimate Fighting Championship history. (Warning, the video is violent.)



Shamrock stopped UFC fighting in 1999 after what's considered to be the one of the greatest fights in UFC history against Tito Ortiz. After that fight, Frank Shamrock was considered the greatest ultimate fighter in history.

After a brief stint as an actor, Shamrock returned to fighting in 2001 and had a number of memorable bouts through 2009, when he was defeated by TKO by Nick Diaz.

Shamrock lives in San Jose

Frank Shamrock lives in San Jose, California with his wife Amy and daughter Nicolette. His official website is at FrankShamrock.com.