This is a description of the death of Pope Pius XXIII, who was the head of the Catholic Church from 1958 to 1963. He passed away on June 3, 1963 at the age of 81 due to natural causes. His death marked the end of an era for the Catholic Church,
From Wikipedia
Pope John XXIII was head of the Catholic Church and sovereign of Vatican City from 28 October 1958 until his death on 3 June 1963.