While Bing reports that Warren simply went silent and fell face-forward to the floor, others state that he started coughing and gasping, and that he cried out "Help me, help me!" before falling to the floor, remaining motionless. Roald Reitan, singing the Surgeon, was on stage with Warren at the time of his death, and attempted to render aid. Although no autopsy was performed, Warren's death was initially thought to have been caused by a massive cerebral hemorrhage, but was later believed by the Met house physician who attended Warren after his collapse, to have been a heart attack; Warren was forty-eight years old. His death affected the Met schedule for several years following; he had been cast in the title role for a future Met premiere of Verdi's "Nabucco" during the 1960–61 season. Warren is interred at Saint Mary's Cemetery in Greenwich, Connecticut. Ted Morgan, writing (as Sanche de Gramont) for the "New York Herald Tribune", won the Pulitzer Prize for Local Reporting, Edition Time in 1961 for his account of Warren's death.