The Boston Archdiocese says a priest accused of stalking late-night TV host Conan O'Brien has checked himself out of a medical facility, against Cardinal Sean O'Malley's wishes.

The Rev. David Ajemian pleaded guilty in April to disorderly conduct after admitting he sent letters and DVDs to O'Brien, who hosts "Late Night" on NBC television. In one of the letters, he called himself one of O'Brien's "most dangerous fans."

After his plea, he was told by O'Malley to remain indefinitely at an unidentified residential treatment facility.

The archdiocese said it was told Thursday that Ajemian left the facility. It said it was a violation of his priestly vows to disobey O'Malley, and Ajemian can no longer function as a priest.