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."

After more than a year of reconciling, the two former 'Cheers' costars finally reveal what started their 30-year feud.

Former Cheers co-stars Kelsey Grammer and Ted Danson recently made headlines when they publicly mended their friendship after almost 30 years of not being on speaking terms. Now, Grammer has finally shared some details about what led to their argument, noting he was at a difficult point in his life at that time.

Dr. Crane’s clarifying. In October, Kelsey Grammer and Ted Danson reflected on their days at the Bull & Finch Pub — revealing that they had a falling out and didn’t speak for nearly 30 years. Now, Grammer is clarifying what actually went down between the two.

“I feel like I got stuck a little bit with you during the Cheers years,” Danson told Grammer at the time. “I have a memory of getting angry at you once. It’s stuck in both of our memories. But I feel like I missed out on the last 30 years of Kelsey Grammer and I feel like it’s my bad, my doing, and I almost feel like apologising to you.”

Kelsey Grammer revealed what he thinks is the origin of his 30-year falling-out with "Cheers" co-star Ted Danson after reconciling last fall.