An important aspect which helped locate him was discovering Guzmán's intention to have a biographical film made. He contacted actresses and producers, which was part of one line of investigation.
The IOC is eager to safeguard the autonomy of sport from government interference, but it said it had been reassured by the Mexican government.
A dispute that could lead to Mexico's suspension from the Olympics will be discussed by the International Olympic Committee leaders next month.
The Mexican government said Thursday that it "welcomed" the decision to indict the agent.
The main points of the report about the disappearance of the Ayotzinapa students released by an independent group of experts from the Inter-American Court on Human Rights.
The group said that the giant funeral pyre in which the attorney general said the Ayotzinapa students were burned to ash beyond identification simply never happened.