Oscar Calvo, one of the primary figures in the reestablishment of the Catholic Church after the Japanese occupation of Guam, sought the beatification of San Vitores for many years. Calvo distributed copies of Alberto Risco's 1970 The Apostle of the Marianas: The life, labors, and martyrdom of Ven. Diego Luis de San Vitores, 1627-1672, translated from Italian to English, to raise awareness on Guam. He visited Spain to search for more information on San Vitores and eventually had a copy of The Life and Martyrdom of the Venerable Father Diego Luis de San Vitores of the Society of Jesus, First Apostle of the Mariana Islands and Events of These Islands from the Year Sixteen Hundred and Sixty-Eight Through the Year Sixteen Hundred and Eighty-One, by Francisco García translated into English. Pope John Paul II beatified San Vitores in Rome in 1985.
