Colman O’Flaherty was born in Ireland ,where he received his early education, and continued his studies at Lyons, France, before coming to Canada and then the United States.. He was ordained a Roman Catholic priest at Sioux Falls, South Dakota, in September 1901, and spent the next nine years at Chamberlain and Kimball, supervising construction of seven church buildings including Columbus College at Chamberlain. In 1910 he was assigned to Holy Family Church at Mitchell, South Dakota, where he was instrumental in the development of Notre Dame Academy there. Prior to World War I he was commissioned as a U. S. Army chaplain, serving in France until he was killed in action. He was the first Catholic chaplain killed in World War I.