In December 2017, the bishop retained an outside investigator who obtained "substantial new evidence" and who concluded the district attorney's 2002 investigation was flawed. The investigator concluded that Bishop Hart had sexually abused two boys in Wyoming.
The diocesan review board, after reviewing the report, concurred with the investigator, finding the allegations "credible and substantiated." The diocese reported the alleged abuse to the Cheyenne district attorney in March 2018, and Cheyenne police opened an investigation.
The diocese said it reported the allegations of abuse as required by its own policy, the national Catholic Church policy, and Wyoming law.
In August 2018, the diocese announced it had found credible a third allegation of child sexual abuse committed by Bishop Hart.
"A third individual reported that he, too, was sexually abused by Bishop Hart in 1980," the diocese said. This third person reported the abuse after the diocese's announcement there was "credible and substantiated" evidence that Bishop Hart had abused two Wyoming boys.
This third allegation was also reported to the Cheyenne Police Department.
Bishop Hart has denied accusations of abusing minors.
His first accusers came forward in 1989, when he was alleged to have abused boys while serving as a priest in Kansas City. Ten individuals named Hart in lawsuits related to child sexual abuse claims dating from the 1970s. These accusations were part of settlements the Diocese of Kansas City-St. Joseph reached in 2008 and 2014, though Bishop Hart denied the accusations, the Missouri diocese said July 2.
Bishop Hart was ordained a priest for the Diocese of Kansas City–St. Joseph in 1956, where he served until he was named an auxiliary bishop in Cheyenne in 1976, and appointed to lead the diocese two years later. He served as Bishop of Cheyenne until his resignation in 2001 at the age of 70.
In June the Cheyenne diocese released a list of substantiated allegations of sexual abuse against minors or vulnerable adults. The release listed allegations against 11 clerics who had served in the diocese.