"There are no words to express my sorrow and regret for the pain I have caused others by words and actions.
"To the people I have hurt, I am truly sorry. As I am writing this, I realise the depth of the damage and disappointment I have left behind at home and at NBC.
"Some of what is being said about me is untrue or mischaracterised, but there is enough truth in these stories to make me feel embarrassed and ashamed."
He said "repairing the damage will take a lot of time and soul searching", adding: "I'm committed to beginning that effort. It is now my full-time job.
"The last two days have forced me to take a very hard look at my own troubling flaws."