Antonio Arregui Yarza was born on June 13, 1939, in Oñate, Guipúzcoa, Spain, and passed away on February 5, 2026, in Guayaquil, Ecuador. His burial took place in the local cathedral, alongside fellow prelates who have served in the diocese, interred beneath the main altar. Known for his strong character and high expectations of himself, he was equally recognized for his humility, generosity, and willingness to serve others.

From an early age, Arregui came to admire the founder of Opus Dei, St. Josemaría Escrivá de Balaguer, and was inspired by the organization's mission to sanctify ordinary work while living among the world rather than separating from it. Despite the potential for a successful civil career due to his family's business background and his own intelligence, Arregui chose a path of devotion to God and service to others, initially as a lay member before pursuing a degree in Canon Law and his ordination as a priest.

His dedication to the Opus Dei organization and his commitment to ecclesiastical life reflect a deep-rooted belief in the importance of integrating faith and daily life, making him a significant figure in his community. His passing marks the end of a life devoted to spiritual leadership and the promotion of a service-oriented life, leaving a lasting impact on those he served throughout his years in Ecuador.