In fresh details provided as a young Mississippi man pleaded guilty to a terrorism-related charge, federal prosecutors said his fiancee led him toward a plan to travel to Syria to join the Islamic State.

Muhammad Dakhlalla, 23, pleaded guilty Friday in Aberdeen to providing material support to terrorism and faces up to 20 years in prison, $250,000 fines and lifetime probation. U.S. District Judge Sharion Aycock hasn't set his sentencing date yet.

His fiancee, Jaelyn Delshaun Young, is set for trial June 6 before Aycock. Plea agreements typically require cooperation with federal prosecutors, so Dakhlalla's plea makes it likely that he would testify against Young if a trial proceeds.

Both remain jailed without bail in Oxford.

A five-page statement of facts added new details about Young's conversion to Islam and her influence on Dakhlalla, who had been raised as a Muslim. The pair at one point planned to claim they were going on their honeymoon while traveling to Syria.

Young, a sophomore chemistry major at Mississippi State University at the time of her arrest, is the daughter of a school administrator and a police officer who served in the Navy reserve. She was a former honor student, cheerleader and homecoming maid at Vicksburg's Warren Central High School.