AFTER the investigation implicating him was opened ... about seven years AFTER the event.
The grand jury report states rather clearly that Paterno told Schultz, who oversaw the police, about the allegations.
I see you have modified 'reported' into 'told' and 'head of the police' to 'oversaw the police'. We are getting closer to the truth!
Please see the post above where I explain how it is, in fact, possible to convey the exact same meaning using multiple phrasings. I understand it’s a waste of time to argue with somebody who is trying to tell me there’s a difference between telling somebody something and reporting something to them. (Not that it matters, but I believe that the report uses the word “reported.”)