HARRISBURG, PA -- Lawyers for a man who claims to be the unknown victim abused in a Penn State shower by Jerry Sandusky says he intends to sue the university.

The lawyers said in a statement that they have done an extensive investigation and gathered "overwhelming evidence" on details of the abuse.

Prosecutors have said they don't know the identity of the boy molested by Sandusky in 2001. The encounter was spotted by a former graduate assistant who reported the abuse to school officials, including Joe Paterno, but none of them told police.