He was bishop-elect of the Diocese of Duluth from June 2020 to September 2020 when he resigned his posts and ceased exercising his ministry following an allegation of sexual abuse of a minor.
[2] He went on to study at Saint Mary's University in Winona, Minnesota, obtaining a Bachelor of Arts in classical humanities from that institution.
[5][6] He served as administrator until the ordination of Peter Michael Muhich as bishop of Rapid City in July 2020.
[8] On August 7, the Rapid City Diocese had received an allegation that Mulloy sexually abused a minor in the 1980s.
[9] The Diocese informed law enforcement officials and ordered Mulloy to "refrain from engaging in ministry".