Longtime U2 tour manager Dennis Sheehan died Tuesday night in West Hollywood. The band confirmed his death via its website. He was on tour with the group in Los Angeles, where U2 was about to kick off a five-night residency. Variety reports Sheehan suffered a heart attack. He was 68.

"We've lost a family member, we're still taking it in," Bono said in a statement. "He wasn't just a legend in the music business, he was a legend in our band. He is irreplaceable."

"Our heartfelt sympathy is with his wonderful family," Arthur Fogel, Live Nation's President of Global Touring, said, calling Sheehan a "dear friend to us all."

Sheehan has served as U2's tour manager for more than three decades. Over the course of his career, he also worked with Led Zeppelin, assisting on their 1975 and 1977 tours, as well as Iggy Pop, Patti Smith, Lou Reed, Siouxsie and the Banshees and members of the Sex Pistols, according to Projection, Lights and Staging News.