The beatification process was set to open in the Archdiocese of Oklahoma City, but the cause had first to be transferred to the archdiocese from Guatemala because a cause opens in the diocese where the individual died; the forum transfer was granted from the Sololá-Chimaltenango diocese to Oklahoma on September 3, 2007. The diocesan investigation process opened on October 5, 2007, and closed on July 20, 2010. The formal start to the cause came under Pope Benedict XVI on November 25, 2009, when Rother became titled as a Servant of God. The diocesan process received validation from the Congregation for the Causes of Saints on March 16, 2012, in Rome and later received the Positio dossier from the cause's officials in 2014. The theologians approved the cause in a unanimous decision on June 23, 2015, as did the cardinal and bishop members of the CCS on October 18, 2016.