Howard Stern and David Letterman recalled their spat in final My Next Guest Needs No Introduction episode of the season

The Hollywood Reporter

The shock jock has been appearing on Letterman's talks shows since 1984. Those appearances turned into an off-air friendship in the 1990s -- that is, until Stern would reveal their private conversations on air. Even though Stern kept appearing visiting Letterman's show, he didn't formally apologize until 2011 during a Late Show visit. "I've apologized to a lot of people. And I'll tell you why. I think I did a lot of growing up," Stern told Letterman. "And I do attribute this to psychotherapy. I was just a young man full of rage. Through psychotherapy I started to fall in love with life a little bit. I started to appreciate what was good. … one of those things was my relationship with you. I could appreciate what you had done for me. I had betrayed your trust, and I was ashamed. The reality was I loved you, and I really felt strongly about you." ALSO: Stern reveals Donald Trump asked him to speak at the Republican National Convention.