“Glenn fought a courageous battle for the past several weeks but, sadly, succumbed to complications from rheumatoid arthritis, acute ulcerative colitis and pneumonia,” reads a post on the band’s official website.
Frey had been suffering from intestinal issues, which caused the postponement of the band’s inclusion in the 2015 Kennedy Center Honors.
Frey and the other original members of the Eagles — Don Henley, Randy Meisner and Bernie Leadon — came together to form singer Linda Ronstadt’s backup band in the early 1970s.
They were all experienced musicians who forged a laid-back, country-tinged sound that the Eagles would eventually make famous.
“We are all in a state of shock, disbelief and profound sorrow,” Henley said in a statement Monday. “I’m not sure I believe in fate, but I know that crossing paths with Glenn Lewis Frey in 1970 changed my life forever, and it eventually had an impact on the lives of millions of other people all over the planet.
“It will be very strange going forward in a world without him in it,” Henley added. “But, I will be grateful, every day, that he was in my life. Rest in peace, my brother. You did what you set out to do, and then some.”
Musicians of all stripes, from Carole King to Huey Lewis to Travis Tritt, posted tributes to Frey on Twitter.