Former UFC lightweight champ Sean Sherk announces retirement from MMA

Former UFC lightweight champion Sean "The Muscle Shark" Sherk announced his retirement from mixed martial arts on Monday.
Sherk exits the sport holding a career record of 36-4-1, as well as a UFC mark of 8-4.
Sherk began his career in 1999, fighting largely in regional shows throughout the midwestern United States. His big break came four years later, when Sherk, then undefeated with a record of 19-0-1, lost a unanimous decision to UFC welterweight champion Matt Hughes.

via:mmafighting.com