Dennis Sheehan, U2‘s longtime tour manager was found dead Wednesday in a Los Angeles hotel room.

The supergroup is just about to kick off a string of huge concerts in the city of angels.

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Law enforcement sources tell TMZ … Dennis Sheehan was found unconscious in his room at the Sunset Marquis Hotel. We’re told paramedics were called to Sheehan’s hotel room around 5:30 AM for a reported cardiac arrest. He was pronounced dead on the scene. Sheehan — who was in his late 60s — has been U2’s tour manager for more than 30 years. His death came just hours after the curtain went down on U2’s first of 5 concerts at the Forum in L.A. h/t tmz

Sheehan worked with rock artists like Led Zeppelin, Iggy Pop, Patti Smith and Lou Reed.

Our thoughts and prayers go out to Sheehan’s family and friends at this difficult time.