Authorities say 25-year-old Alexander Waterland, of Loveland, Ohio, pleaded guilty Thursday to a charge of conspiracy to commit Internet extortion. Brett Hudson, of Hillsboro, Ohio, pleaded guilty in October.
The FBI says the men claimed to be members of the hacking group Anonymous who had obtained confidential information on students and faculty.
The threats were considered extortion because they demanded that the school apologize for not safeguarding students whose personal information had supposedly been stolen. That turned out to be a bluff.
Sentencing for Waterland is scheduled for March 13.