(CNN) -- Jerry Sandusky, the disgraced former Penn State coach now facing child rape charges, was in a Pennsylvania judge's chambers for a closed-door hearing Tuesday, Centre County Sheriff Denny Nau said.
The subject of the more-than-two-hour hearing remained unknown Tuesday evening. But Nau said a pretrial hearing was still scheduled for Wednesday, though Sandusky was not expected to attend.
Several of the people prosecutors accuse Sandusky of abusing have asked a judge to protect their identities at trial.
Sandusky, 68, has been under house arrest since being charged with sexually abusing 10 young boys over a 14-year period. Related allegations that university officials failed to act on a complaint about Sandusky led to the November firing of the school's president and of legendary Penn State head football coach Joe Paterno, who died of lung cancer three months later.
Sandusky has pleaded not guilty to the charges and was set to go on trial in June.
Tim Curley, Penn State's former athletic director, and Gary Schultz, a former university vice president who oversaw campus police, have been charged with perjury and failing to report an alleged 2001 sexual assault of a child.
Both of them have pleaded not guilty, and their attorneys have said that the prosecution "charged this case before it knew the facts."
CNN contributor Sara Ganim contributed to this report.