Pennsylvania Governor Tom Corbett says the pace of the investigation into Jerry Sandusky's child sex crimes was necessary to build an "ironclad" case against the former Penn State assistant coach.
 
Corbett told CBS' "This Morning" on Monday that the investigation might have taken longer than people would have liked but prosecutors needed to find as many witnesses as possible.
 
Sandusky was convicted Friday on 45 of 48 counts. He will likely spend the rest of his life behind bars for abusing 10 boys. Corbett was attorney general when the investigation began following sex assault allegations in 2009. Sandusky wasn't charged until November 2011.
 
Corbett says Penn State's trustees are still awaiting the results of an internal investigation by former FBI director Louis Freeh into the school's handling of Sandusky.