He was born on September 3, 1921. Fr. McMahon was ordained to the priesthood in Ireland on June 13, 1948 for the Diocese of Tucson. Upon his arrival he was served at St Cyril’s parish in Tucson, St Phillip Parish in Payson and then as pastor of St. Mary’s Parish with responsibilities at Seton High School. From 1959 through 1968 Fr. McMahon initiated the necessary elements to build a new facility for the elementary school, build a new convent, and add a new gymnasium at Seton.
In 1968, Fr. McMahon was assigned to St. Theresa Parish where he served as pastor for 23 years. During these years he saw the beginning of the Diocese of Phoenix and he built St. Theresa church and parish center. He was assigned as coordinator of the Papal visit during which the Holy Father honored him with the title of Monsignor.
Msgr. McMahon served as Director of Mt. Claret Center, the Cursillo Movement, Chaplain of the Order of Malta, was a spiritual advisor to St. Vincent de Paul Society, Christ Child Society of Phoenix, and Chaplain for the Arizona State Council for the Knights of Columbus . He was also on the board of the Huger-Mercy Foundation. He was also the Vicar for Diocesan Buildings and Properties for over 25 years.
He was most recently instrumental in the building of the beautiful new St. Francis of Assisi Church in Ak-Chin for our Native American people. Msgr. McMahon was definitely a effective builder, but he built far more than buildings. He will always be remember for building the faith of the people he served through his pastoral care, wisdom, and love for his priesthood.
The visitation and vigil took place on Thursday November 13th at St. Theresa Parish, 5045 E Thomas Rd, Phoenix, from 6-8:00 PM. The Funeral Mass was celebrated on Friday November 14, at 10:00 AM at St. Theresa Parish. Burial took place in Ireland.