Marianist Blessed Carlos had written in applying for vows: "The service of God, the practice of love toward the Divine Model and Mary his most holy Mother, I want that these be the aims of my entire life. That is the way he offered his life at the end."
When the civil war broke out in Spain, on July 24, 1936, the Colegio del Pilar was seized and the Marianist Community dispersed. Brother Carlos took refuge in Ciudad Real. There he was arrested on September 6 by the militiamen and taken to the seminary, where he remained for twelve days in complete isolation. The following September 18, he was taken from his cell and shot in Alarcos , near Ciudad Real.