Instead of being disciplined, Father Murphy was quietly moved by Archbishop William E. Cousins of Milwaukee to the Diocese of Superior in northern Wisconsin in 1974, where he spent his last 24 years working freely with children in parishes, schools and, as one lawsuit charges, a juvenile detention center. He died in 1998, still a priest.

Even as the pope himself in a recent letter to Irish Catholics has emphasized the need to cooperate with civil justice in abuse cases, the correspondence seems to indicate that the Vatican’s insistence on secrecy has often impeded such cooperation. At the same time, the officials’ reluctance to defrock a sex abuser shows that on a doctrinal level, the Vatican has tended to view the matter in terms of sin and repentance more than crime and punishment.

The Vatican spokesman, the Rev. Federico Lombardi, was shown the documents and was asked to respond to questions about the case. He provided a statement saying that Father Murphy had certainly violated “particularly vulnerable” children and the law, and that it was a “tragic case.” But he pointed out that the Vatican was not forwarded the case until 1996, years after civil authorities had investigated the case and dropped it.

Father Lombardi emphasized that neither the Code of Canon Law nor the Vatican norms issued in 1962, which instruct bishops to conduct canonical investigations and trials in secret, prohibited church officials from reporting child abuse to civil authorities. He did not address why that had never happened in this case.

Image Arthur Budzinski, at a cemetery behind St. John's School for the Deaf, says he was first molested in 1960 when he went to Father Murphy for confession. Credit... Jeffrey Phelps for The New York Times

As to why Father Murphy was never defrocked, he said that “the Code of Canon Law does not envision automatic penalties.” He said that Father Murphy’s poor health and the lack of more recent accusations against him were factors in the decision.

The Vatican’s inaction is not unusual. Only 20 percent of the 3,000 accused priests whose cases went to the church’s doctrinal office between 2001 and 2010 were given full church trials, and only some of those were defrocked, according to a recent interview in an Italian newspaper with Msgr. Charles J. Scicluna, the chief internal prosecutor at that office. An additional 10 percent were defrocked immediately. Ten percent left voluntarily. But a majority — 60 percent — faced other “administrative and disciplinary provisions,” Monsignor Scicluna said, like being prohibited from celebrating Mass.