"What happens is self-preservation sets in and when people have this type of information, they just deny it's actually occurring because they're concerned about it affecting their career," former FBI agent and ABC News contributor Brad Garrett said.
Penn State head football coach Joe Paterno, the winningest coach in college football history, is also facing intense scrutiny. Although he is not being charged, Paterno was the one the graduate student first notified in 2002. He allegedly relayed the incident to Curley.
"Joe Paterno was a witness who cooperated and testified before the grand jury," state attorney general's office spokesman Nils Frederiksen told The Associated Press. "He's not a suspect."
He said it was far too soon to say whether Paterno might testify if the case goes to trial.
"That's putting the cart way ahead of the horse," he said. "We're certainly not going to be discussing the lineup of potential witnesses."
Attorneys for all three men said their clients were not guilty.
Curley and Schultz are scheduled to surrender on Nov. 7.
Sandusky is free on $100,000 bail and is scheduled to attend a preliminary hearing on Nov. 9.