Tape: Sandusky's adopted son talks of sex abuse

BELLEFONTE, Pa. — NBC News obtained exclusive audio recordings of Jerry Sandusky's adoptive son, Matt Sandusky, as he detailed to police the abuse he said he endured.

NBC News obtained the 29-minute audiotape, which was recorded by police detectives on June 15, four days after the Jerry Sandusky trial began. At the time, the detectives were preparing Sandusky’s son to testify as a surprise prosecution witness at his father’s trial.

Matt Sandusky told investigators that he tried running away and at one point, wanted to die. He said he was repeatedly molested and would try to avoid being touched by hiding in a fetal position when Jerry Sandusky entered his room.

Matt Sandusky said he met Jerry Sandusky through the Second Mile and before he was adopted by the Sanduskys he would stay at the family's home.

For years, Matt Sandusky had publicly stood by his father and even showed up on the first day of the trial, sitting with the rest of the Sandusky family. But after listening to the first day of testimony from a young man known in court documents as "Victim 4," Matt Sandusky contacted police and volunteered to testify on behalf of the prosecution. The prosecutors’ plan was to use Matt Sandusky as a rebuttal witness if Jerry Sandusky took the stand in his own defense.

Matt Sandusky told police that he has been seeing a therapist and memories of his abuse are just now coming back. He said he is coming forward now so his family would know what really happened.

Portions of this article were written by Michael Isikoff, NBC News

WPXI