According to one source, he had received minor orders in France and when he arrived in the United States, he taught music in New York City.
However, it was reported in Historical Records and Studies that in 1842, while on a similar mission trip, Deydier was appointed temporary administrator of the new French Parish in New York City, St. Vincent DePaul.
Saint Theodora Guerin, foundress of the Sisters of Providence, St. Mary of the Woods wrote in her journal "So extreme was his poverty and so complete his destitution, that I shall run the risk of being accused of exaggeration in describing it.
In the "History of Vanderburgh County" it was written: It was a noticeable feature of the Catholic priesthood in the pioneer days that wherever they found a community, no matter how small or how widely scattered, wherein they could establish a mission, there the cross was erected and the protecting care of the church spread over the inhabitants.
Father Buteux, and the companions of his journey, who lodged on their arrival here, at the Mansion House, then kept by Francis Linck, a citizen well remembered to this day and esteemed by all the older inhabitants of the city.
After almost a year's residence at the house of Mr. Linck, in January, 1838, he built a lodge room, 10x15 feet size, at the corner of Fifth and Chestnut streets.
He labored heroically among his people, did much missionary work in the country adjacent to Evansville, and in 1838 made a successful trip to the east to raise funds for the erection of a church building.
When old age and increasing infirmities had impaired his usefulness, he retired from the active ministry and, returning to Vincennes, passed the evening of his life in comparative rest, greatly beloved by all who knew him.