The Arapahoe County coroner's office says he died Sunday at his Cherry Hills Village home. An autopsy was planned for Monday to determine the cause of death.
Among the tens of thousands of shows he promoted during his 30-plus year career was U2's legendary performance at Red Rocks Amphitheatre in 1983, captured in the "Under a Blood Red Sky" video. It increased the outdoor venue's popularity, and Fey was eventually able to get Bruce Springsteen to play there.
The Denver Post reported Fey was recovering from hip replacement surgery at the time of his death.
"When he was into it, there was nobody close to him as a promoter," said longtime colleague and friend Chuck Morris, of AEG Rocky Mountains.
Fey was raised in New Jersey and moved to Chicago when he was 11. The first show he booked was Baby Huey and the Babysitters in 1965 Illinois. He remained in Colorado after booking the Association for a fraternity party at the University of Denver.
Fey is survived by four sons, Tyler, Jeremy, Geoffry and Alan.