Why Qaddafi was surrendered alive?

I think Qaddafi never wanted to surrender to Libyan fighting him as he knew how terrible could be his death.
More probably Qaddafi was deceived, he was told to surrender to NATO but NATO operatives had orders to sell him to his assassin. 

I spoke 2day to one pro gaddafi woman over the phone. I asked her why do you like gaddafi? She said: I dont know but he is my soul. libya