TODAY | January 06, 2013
>>> in an interview with oprah winfrey , funny man, david letterman opens up about some of the most controversial and emotional moments in his life. a rare glimpse into the life of a man most of us have followed nor years but know little about.
>>> in now, in all his splendor, " david letterman ."
>> reporter: for more than 30 years, he has made us laugh.
>> did the kids really enjoy the christmas activities?
>> not really.
>> reporter: the comedian used to answering questions now finds himself answering them to oprah.
>> i have read about your struggle with depression, yeah.
>> do you still get depressed?
>> i never knew what depression was. i am kind of sad today. i am kind of blue today. this, i'm telling you, you get on an elevator and the bottom drops out. i went through this for about six months.
>> reporter: in a sit-down with winfrey, set to air later today , letterman tells all, including speaking openly about his infidelity. in 2009 after a former cbs producer tried to blackmail letterman for $2 million. the then recently married talk show host revealed a string of affairs live on the air.
>> having living through that sex scandal .
>> just to say sex scandal , you want to get through your whole life and not have the word sex scandal attached to your name.
>> you didn't mapke it?
>> did not make it.
>> letterman who has a child with wife, regina lasco speaks openly of repairing his marriage.
>> did you think she would stay with you through the whole thing?
>> doesn't know. wasn't certain.
>> did you have to sleep on the coach?
>> i slept a wide variety of places.
>> this is the worst super bowl party ever.
>> letterman for years feuded with winfrey herself.
>> now, dave, be nice.
>> he is just saying that because i'm here.
>> also spoke of his long-time rivalry with jay leno .
>> i am happy to say, he is the funniest guy i have ever known. just flat out, therefore, the fact that he is also maybe the most insecure person i have ever known, i could never reconcile that.
>> a rare glimpse inside the life of a private man so many of us know. for "today," miguel almaguer, nbc