A fan asked him what he thought of Pistorius, he replied "he's a legend".
The question in the tweet referred to Pistorius being charged with murder after allegedly shooting dead his model girlfriend in his Pretoria home.
Carter was unaware of the news.
A user then asked Carter if he knew about Pistorius' arrest and he replied:
"Oh no I havent what's happened?"
Fans quickly stepped in to let Carter know what had happened - telling him to check the news.
One tweet from user Cam said, "No worries mate, just thought I'd give you a heads up! Only happened late last night."
RedfromNZ tweeted: "you might wanna retract that tweet fella."
Carter replied: "Ok I have now read the news and totally take my comment back. Shocking news!"
Rugbyfan1033 said "but surely he's still a legend for his sporting achievements? Innocent until proven guilty."
