CHAMPAIGN, Ill. (AP) — A criminal complaint says the smartphone of Brendt Christensen, who is charged in the kidnapping of a visiting Chinese scholar, was used to visit an online forum in April called “Abduction 101,” months before the abduction.

The federal charging document released Friday says that among the threads on the forum was one entitled, “Perfect abduction fantasy.”

Authorities said in a statement they believe Yingying Zhang to be dead. She disappeared on June 9, just weeks after arriving at the University of Illinois.

The charging paper only briefly mentions the online forum. It doesn’t provide details about the content of the forum.