Castro Medellín was born in Mineral de La Noria,
Sombrerete, Zacatecas,
Mexico, in the Archdiocese of Durango, on 21 June 1938, the third of five children. After studying at the College of St. John Baptist de la Salle, he studied for the priesthood at the seminary of the in
Uruapan. In 1971 after two years of study he earned a licentiate in moral theology at the
Alphonsian Academy in Rome. He took his final vows as a member of the Missionaries on 10 January 1960 and was ordained a priest as a member of the Missionaries on 16 June 1963 in Uruapan by Bishop José Gabriel Anaya y Diez de Bonilla. He died on 24 January 2020. ==References==