Celebrated singer-songwriter Lou Reed, who previously fronted the Velvet Underground and was seen as a leader in rock and roll, died on Sunday. He was 71.

Rolling Stone is reporting that a cause of death has not yet been released, but Reed underwent a liver transplant in May after canceling a show at Coachella. "I am a triumph of modern medicine, physics and chemistry. I am bigger and stronger than ever," he said back then via his website.

With the Velvet Underground, Reed wrote and performed many iconic songs, including "Heroin," "Sister Ray," "Sweet Jane," "Rock and Roll," "Venus in Furs," "All Tomorrow's Parties," "What Goes On" and "Lisa Says."

Updated: Reed's publicist has confirmed the musician's passing.