Here's the full text of what he said, according to a transcript provided by the White House:
Mr. President, Mr. Secretary-General, fellow delegates, ladies and gentleman: I would like to begin today by telling you about an American named Chris Stevens.
Chris was born in a town called Grass Valley, California, the son of a lawyer and a musician. As a young man, Chris joined the Peace Corps, and taught English in Morocco. He came to love and respect the people of North Africa and the Middle East, and he would carry that commitment throughout his life.