ST. LOUIS • A Washington University official whose retirement for “personal reasons” was announced this month has been indicted on a federal child pornography charge.

Justin X. Carroll, the university’s dean of students and interim athletic director after a 36-year tenure at the university, was indicted on a charge of access with intent to view child pornography.

Federal investigators tracking a group of people sharing child pornography online identified Carroll as one of the participants by tracing internet protocol addresses to computers at Washington University and Carroll’s home in University City, according to prosecutors. The indictment covers activity between November 2015 and December 2016.

The indictment lists an alias of “MOperv” for Carroll, and says that he was caught with videos that featured prepubescent boys.

Authorities said the investigation did not find any wrongdoing involving Carroll’s university responsibilities or students. U.S. Attorney Richard Callahan said Washington University cooperated with the investigation.