Martin Albert Otillio was born on 11 July 1931 in New Orleans, Louisiana to Paul Frank and Lillian Juanita (Reine) Otillio. He was one of nine children. Besides his parents, four brothers and three sisters preceded him in death, namely, Paul Frank (died as an infant), Paul Frank, Narcisse, Gloria, Lillian, and Vera. His brother Hilary was his last living sibling at the time of his death. Martin attended John Dibert Grammar School (1936-37) and Saint Anthony of Padua Grammar School (1937-45). In 1949 he graduated from Saint Aloysius High School in New Orleans. The Fall of 1949 he enrolled at Loyola University in New Orleans and the next year transferred to Loras College, Smyth Hall in Dubuque to begin formation and preparation to enter the Dominican Order. On 30 August 1951 he received the Dominican Habit, given the religious name, Peter, and began the novitiate at Saint Peter Martyr Priory in Winona, Minnesota. One year later, on 31 August 1952, Brother Peter professed his simple vows in the hands of Father Nicholas John Walsh, O.P. at Saint Peter Martyr Priory. After the novitiate, he moved to Saint Thomas Aquinas Priory in River Forest, Illinois to begin his studies for the priesthood. On 31 August 1955 he professed his solemn vows in the hands of Father Michael James Patrick Clancy, O.P. at Saint Thomas Aquinas Priory. He studied Philosophy in River Forest (1952-55), then was sent to California to study Theology at Saint Albert's College in Oakland (1955-59). He was ordained to the priesthood on 21 September 1957 at Saint Dominic's Church, San Francisco, California by Archbishop Finbar Ryan (Port of Spain, Trinidad). After ordination he was sent to Saint Rose Priory in Dubuque, Iowa for his "young dad" year.

Father Peter's first assignment in the Fall of 1959 was to the missions in Nigeria, West Africa, that the province had begun a few years earlier. This is where he would spend the next fifty-seven years. The following is taken from a brief biography written about him by a

friar from the Province of Saint Joseph the Worker, Nigeria & Ghana: "Fr. Otillio was assigned to Nigeria and arrived on 7 October 1959. For over 26 years (1959-86), he worked in several places in the Sokoto Prefecture, which became a Diocese in 1986. Some of the places included: Saint Theresa's Church, Funtua and Malumfashi, both in Katsina State; and Yelwa, Sokoto Diocese-now Kebbi State-where he spent 24 years. Subsequently he was assigned to the Dominican Community, Saint Thomas Aquinas Priory, Ibadan. At Ibadan, he was prior for two terms (6 years) and then was assigned to Saint Dominic's, Yaba, Lagos, where he was also prior. He came back to Ibadan and was prior once more. He remained in Ibadan until he left the shores of Nigeria for the United States of America. It was expected that he would return to Nigeria, but that was not to be." Father Peter was a holy man, always reading something about the Saints and trying to incorporate what he read and learned into his own life.

As he grew older and his health began to decline, the decision was made to have him return to the province for better health care. On the Feast of Our Lady of the Rosary, 7 October 2015, (the same day 56 years earlier he arrived in Nigeria) Father Peter was assigned back to the Province of Saint Albert the Great, to Saint Pius V Priory, Assisted Living Care. He lived here a little over three years. He was always a welcoming friar to the many visitors who came to the priory. He had a great love for food and enjoyed his time at table with the brothers. He died peacefully in his room at the priory late in the afternoon of 20 December 2018 at the age of eighty-seven. The community gathered around him, sang the Salve Regina, and Father Louis Morrone, O.P., prior, blessed his body and the community prayed over him.

At the time of his death, he was survived by one brother, Hilary Otillio of New Orleans, Louisiana, as well as numerous nieces, nephews, cousins and close family friends. Services were held at Saint Vincent Ferrer Church in River Forest, Illinois on Thursday, 3 January 2019 beginning with sung Morning Prayer at 9:00AM followed by visitation with Mass of Christian Burial at 10:00AM. Father James V. Marchionda, O.P., Prior Provincial presided at the Mass and Father Edward Riley, O.P., preached. A reception was held at Kyte Hall at Saint Vincent Ferrer Parish. Burial was in the Dominican plot at All Saints Cemetery in Des Plaines, Illinois. A memorial Mass was held in New Orleans, Louisiana at his home parish of Saint Anthony of Padua on 16 March 2019. Funeral arrangements were handled by Smith Corcoran Funeral Home in Chicago, Illinois.