The landscape of the trial of a Catholic Church official accused of endangering children by exposing them to allegedly abusive priests changed Thursday after one of the official’s co-defendants admitted in court to sexually abusing a 10-year-old.

The former priest pled guilty to the first-degree felony of involuntary deviate sexual intercourse for sexually abusing a 10-year-old boy. The priest also pled guilty to the third-degree felony of conspiracy to endanger the welfare of children for conspiring with church officials to conceal his history of sexual abuse from Catholic Archdiocese of Philadelphia parishioners.