Lou Reed, co-founder of the Velvet Underground and one of the most influential songwriters in rock history, died today at 71, according to multiple reports.

No official cause of death had been cited at press time, but Reed’s literary agent, Andrew Wylie, told the New York Times that he believed it was related to Reed’s liver transplant in May of this year.

“He died peacefully, with his loved ones around him,” Dr. Charles Miller, the doctor who performed Reed’s transplant, told the paper. Reed’s death was first reported in Rolling Stone.