An FBI translator assigned to investigate an ISIS terrorist went rogue and married the ISIS operative, CNN reported Monday. The translator, Daniela Greene, had top-secret security clearance and was assigned to investigate Denis Cuspert, a German rapper who began producing recruitment videos for ISIS, including one in which he held a severed human head. Greene was already married when she was assigned to investigate Cuspert in January 2014, according to court records reviewed by CNN. But by June, she had made plans to travel to Syria, under the guise of visiting her parents in Germany. Instead of flying to Germany, she traveled to Syria, where she married Cuspert. Shortly after the marriage, Greene appeared to regret her decision, writing in an email that "I really made a mess of things this time." She escaped Syria and returned to the U.S., where she was charged and convicted of making false statements involving international terrorism. She was sentenced to two years in federal prison, and was released in summer 2016. Her two-year sentence was considerably less than those of many other Americans who attempted to join ISIS.