Father Morris became interested in nuclear non-proliferation during the 1970s when he became acquainted with protesters gathered outside the Bangor Trident Base in Bangor, Washington. Among the activists whom Morris befriended was Father George Zabelka, a Catholic priest who had served as the chaplain for the crew of the Enola Gay, which dropped the atomic bomb on Hiroshima during World War II. In 1982, Morris began leading the 6,500 mile Bethlehem Peace Pilgrimage from Washington state in the U.S. to draw attention to the proliferation of nuclear weapons and promote peace within a Christian tradition. The walk, which became known as the Bethlehem Peace Pilgrimage, would take twenty months to complete. His inspiration for the walk included one particular teaching of Jesus, "But I say unto you, love your enemies, bless them that curse you, do good to them that hate you, and pray for them that despitefully use you and persecute you." Morris spearheaded the idea and enlisted supporters, including Father Zabelka, to join the walk to Bethlehem in the West Bank. The group began their walk at what is now called the Bangor Naval Base in Bremerton, Washington, on April 9, 1982, which was also Good Friday. Morris said that the Good Friday starting date was symbolic because he believed that nuclear weapons had the potential to "crucify the entire human race." The youngest walker participating was twenty years old, while the oldest was sixty-seven. They slept in private homes and churches, and covered approximately twenty miles per day. In a 1982 interview with the Associated Press, Morris stated that reaction to the walk was largely positive. He recounted only a few instances when hecklers would yell insults such as "Go do it in Russia" at the group. The group arrived in Washington D.C. just before the winter of 1982. They rested before flying to Ireland, where they continued their march to Bethlehem. The walk took them through eleven countries, including Yugoslavia and nations within the Middle East. Morris' group arrived in Bethlehem on December 24, 1983. All the participants who began the walk in Washington were able to complete the walk all the way to Bethlehem. In 2012, Morris recounted that he was glad the pilgrimage was over because, "I was tired of walking." Each year, new Jesuit Volunteer Corps trainees are given a presentation on the Bethlehem Peace Pilgrimage and the values the walk represents as part of their initial training.
Later life
Morris also founded the Senior Chore Service, which serves low income senior citizens. Morris opened the Senior Chore Service during the early 1980s in conjunction with Catholic Charities of Seattle. He then worked with refugees in Uganda throughout the 1990s. In 2002, Morris was sent back to the United States, where he served as a parish priest in Rockaway Beach, Oregon, until his retirement due to declining health. In 2012, Morris celebrated his 50th anniversary as a Jesuit. He was writing a memoir, as of August 2012, at his residence at the Jesuit House infirmary on the campus of Gonzaga University.
Morris's Passing
Father Morris died from cancer at the Jesuit infirmary in Spokane, Washington, on September 30, 2012, at the age of 84. His funeral was held at Gonzaga University with burial at the Jesuit's Oregon Province Cemetery. He was survived by his two brothers, Patrick and Robert.