Edward J. McNelis says director Robert Miller inadvertently put the mental health records of Seung Hui Cho in a box when he left his job at the school's counseling center more than a year before the massacre occurred, the Washington Post reported Friday.
McNelis made the disclosure after Virginia Gov. Timothy M. Kaine revealed a criminal investigation was under way into the unexpected reappearance of the records at Miller's home.
At the time of the shooting, Miller told officials that he did not know the whereabouts of Cho's records.
A lawsuit filed on behalf of the families of two of the shooting victims prompted the discovery of the files.
Kaine said Thursday authorities are working to determine whether Miller is telling the truth and why he took the documents.