Attorneys plan to use Jerry Sandusky's mental health as a key element in their defense.
After four days of graphic testimony against him, Jerry Sandusky is set to tell his side of the story, and it appears a mental health expert might play a part in his defense.
On Friday the judge presiding over Sandusky's sexual abuse case ruled the defense team may present expert testimony that Sandusky suffers from a personality disorder which could help explain some of the letters and contracts he sent to the accusers he met through his Second Mile charity.
NBC Legal Analyst Wes Oliver says the defense needs to blunt the impact of those documents.
"Sandusky had kept a copy of this, which adds sort of to the creepiness factor," Oliver says.
Sandusky is charged with 52 counts of child sex abuse.
He's accused of molesting ten boys over a 15 year period.
Last week eight of those alleged victims told similar, disturbing stories of time spent with Sandusky which included naked showers, sleepovers and ultimately unwelcome sexual contact.
A former Penn State graduate assistant told jurors he saw Sandusky with a young boy in the Penn State coaches' locker room a decade ago.
Sandusky's attorneys maintain accusers are simply lying or trying to cash in with possible civil lawsuits.
"They now have to go back and substantiate with evidence those two claims," Oliver points out.
It's likely Sandusky himself will testify in his own defense.
Jurors might also hear from his wife Dottie and children from Sandusky's charity who never saw anything inappropriate from the former coach.