You are asking about the real Chuck Norris or someone in these forums using that name?

If it's about the real real Chuck Norris, then he was the 6 or 7 times (not sure) undefeated World Middleweight Karate champion (during the 60s and 70s). He became famous as a celebrity when he fought Bruce Lee in the movie The Way of the Dragon. I think he also cherographed the fight scenes in the movie.

After that he made many Martial Arts Films, and also starred in the TV series "Walker, Texas Ranger". I think the series was shown on Malaysian TV before a few years back.

There are also some rumours in the Internet about his death , but I think there are just pranks.