The former "Cheers" star told the New York Post his estrangement began when he was "going through a lot of self-doubt; self-loathing,” and "drinking a lot."

Two of the show’s stars, Kelsey Grammer and Ted Danson, infamously had a falling out that lasted over 30 years. Now, Grammer has opened up about their feud including what it was about and how they mended things.