Kenny Chesney shared a tribute to the Grammy-winning country songwriter, Brett James, who worked on many of his biggest hits, including “Out Last Night.”“I can’t believe I’m saying it but adios Brett James,” the country star wrote. “Thank you for being a lifer, for being a shirtless, sunburned troubadour, for your friendship, your songs and all the laughs. Chesney admitted he didn’t want to post anything because he “didn’t want to believe” the tragic news. “Brett and I shared a unique bond,” he wrote. Underwood, in her own tribute, called James’ death “unfathomable,” adding, “Brett’s passing is leaving a hole in all of us that I fear won’t ever go away.