Serra Catholic High School is asking former students to come forward if they were abused by Franciscan Brother Kenneth Ghastin, a teacher at the school between 1983 and 1991.
Brother Ghastin was accused of abusing two minors in Boston in the 1970s, according to a letter sent to Serra Catholic alumni.
The Rev. Ronald Lengwin, spokesman for the Catholic Diocese of Pittsburgh, said there have been no allegations of misconduct against Brother Ghastin during his time at Serra Catholic, and the letter is "part of our procedure."
Although the letter explains Brother Ghastin was accused of abuse about 20 years ago -- and it was reported in the Boston Herald in 2002 -- Father Lengwin said "we didn't hear anything about him until now."