Ms. Nuzzi told her editors about the relationship that had turned personal, the outlet said. A representative for Mr. Kennedy said the pair had met only once.

Following her admission, New York Magazine announced in a note to readers Thursday night that Nuzzi has been put on leave.

This has been a very delicate matter and it only has become even more tense in the middle of a presidential race. New York magazine announced late Thursday night that one of its re