A priest from Boston has been charged with stalking and harassing the talk show host Conan O’Brien, law enforcement officials said last night.

The suspect, David Ajemian, was arrested on Friday when he tried to attend a taping of NBC’s “Late Night With Conan O’Brien” program at Rockefeller Center, the police said. The priest is being held in jail for a court-ordered psychiatric examination, and is due back in court tomorrow.

Court papers quote from menacing postcards and letters — at least some written on a parish letterhead — that Father Ajemian is alleged to have sent to Mr. O’Brien’s home and television studio for more than a year. The letters continued even after the priest was asked to stop, law enforcement officials said.