Reverend David Ajemian, a priest in the Archdiocese of Boston, has been accused of writing O'Brien threatening notes on parish letterheads, contacting his parents and showing up at the New York studio where he works.
He was arrested earlier this month while trying to enter a taping session of NBC's Late Night with Conan O'Brien.
On Friday, Ajemain's lawyer told a New York hearing that his client has been treated for psychological problems, but State Supreme Court Justice Abraham Clott ruled Ajemian fit to stand trial.
Ajemian, who has been placed on leave by the Boston Archdiocese, could face up to a year in prison if convicted of aggravated harassment and stalking.
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