"We've lost a family member, we're still taking it in," U2 frontman Bono said in a statement posted on the group's website. "He wasn't jut a legend in the music business, he was a legend in our band. He is irreplaceable."
Sheehan did a rare interview in 2013 and revealed that he got his first job as a tour manager at the age of 19. Over the years, he worked with the likes of Led Zeppelin, Iggy Pop, Patti Smith and the late Lou Reed. "They were about to bring out The War album," recalled Sheehan of first starting with U2 in 1982. "And we haven't looked back since."