Actor and musician Steve Martin wrote a touching tribute following the news of his good friend's passing. "My friend from the early days, and important member of Eagles, has died. We loved you, Glenn Frey," Martin, 70, tweeted.
Many A-list stars and fellow musicians paid their respects including Carole King, Huey Lewis and Kiss band members Paul Stanley and Gene Simmons.
"R.I. P. Glenn Frey. Deepest condolences to his family and #Eagles," King wrote while Stanley tweeted, "SHOCKED to report the death of GLENN FREY. Eagle & brilliant songwriter. We shared some memories at RRHOF. Shocked..."
Frey's bandmates Don Henley and Joe Walsh confirmed the death in a statement shared on the Eagles' official website.
"Glenn fought a courageous battle for the past several weeks but, sadly, succumbed to complications from rheumatoid arthritis, acute ulcerative colitis and pneumonia," the message read.
Glenn Fry - our condolences to friends and family. Rest In Peace.
— Gene Simmons (@genesimmons) January 18, 2016
R.I.P. Glen Frey....Thank you for all the great songs and powerful lyrics...Jesus can the reaper please take break for awhile.....
— Nikki Sixx @NikkiSixx) January 18, 2016
"As a founding member of the Eagles, Glenn Frey was an integral part of one of the most storied bands in pop history. His songwriting, especially with bandmate Don Henley, resulted in some of the biggest hits and standards of the '70s," said Neil Portnow, president and CEO of The Recording Academy, in a statement. " The band's Their Greatest Hits: 1971-1975 remains one of the best-selling albums of all time, a testament to the enduring music that Glenn played a significant role in creating. Glenn's untimely passing is a huge loss for the music community, and we offer our condolences to his family, friends, colleagues, and fans."
Among others who expressed their sorrows on social media was Niall Horan, Miles Teller, Sheryl Crow, Nikki Sixx and Hillary Scott.