Mike McQueary, the former Penn State graduate assistant who has long claimed he saw Jerry Sandusky rape a boy in 2001, has filed a lawsuit against Penn State.

In a three-count complaint filed Tuesday in the Centre County Court of Common Pleas, McQueary sued the university for $4 million—his projection of his own earnings over 25 years coaching Penn State football—under whistleblower, defamation and misrepresentation causes of action. He claimed the school wrongfully fired him only as a result of his cooperation with investigators, as authorities built and brought a case against former Penn State assistant football coach Sandusky.