Priest Royce Thomas was notified of the decision on Sunday, according to Bishop Anthony Taylor.
Taylor said the decision was based on a "history of professional misconduct."
While Thomas remains a Catholic in good standing, he is restricted from public ministry as a layman in the church.
The bishop released the following statement:
It is my sad duty to announce that on Dec. 29, 2012, I received from the Congregation for the Clergy in Rome their decree imposing on (former) Msgr. Royce R. Thomas the ecclesiastical penalty of involuntary dismissal from the clerical state. This decree dispenses him from all the obligations connected with sacred ordination, including sacred celibacy, and deprives him of all ecclesiastical honors previously received and offices previously held. This ecclesiastical penalty was imposed due to a history of professional misconduct as a priest, and the decree stipulates that there is no further recourse to this supreme and final decision. I met with (now) Mr. Thomas on Jan. 6, 2013 as directed by the Congregation for the Clergy to inform him of this decree. While he remains a Catholic in good standing, the congregation also required me to inform him of the restrictions imposed on him by Rome regarding any future public ministry as a layman in the Church. Please keep him in your prayers.