Pius XI died at 5:31 a.m. (Rome Time) of a third heart attack on 10 February 1939, at the age of 81. His last words to those near him at the time of his death were spoken with clarity and firmness: "My soul parts from you all in peace." Some believe he was murdered, based on the fact that his primary physician was Dr. Francesco Petacci, father of Claretta Petacci, Mussolini's mistress. Cardinal Eugène Tisserant wrote in his diary that the pope had been murdered, which was a statement that Carlo Confalonieri later strongly denied.