wecht also decided to visit the murder scene.ed that dr. yelenic had been injured already in the back part of the house. andrea canning: dr. wecht believed the assailant then chased john yelenic through the house. it's a very mobile situation. you're fleeing from me, and i'm chasing you. and i'm inflicting injuries as you go along. [camera shutters] andrea canning: dr. wecht explained why the window by the front door was broken and covered in blood. cyril wecht: his head is pushed through this multi-paned glass arrangement on the right side of the door, looking at it from the inside. andrea canning: john yelenic suffered massive, possibly fatal, injuries to his neck when his head was pushed through the glass. but the attack wasn't over. dr. yelenic then, finally, fell to the ground, obviously, and his throat then was slashed. andrea canning: as a forensic scientist with more than 50 years experience, dr. wecht surmised the killer had to be strong and large enough to overwhelm the nearly 6-foot-tall dentist and to slash him with a

wecht is a forensic pathologist in pittsburgh, 100 mile west of penn state.worked on the case but he followed it for years. he made news with his comments after the sandusky story broke. he believes there must've been rumors sandusky was continuing to abuse young boys after 1998. he says ray gricar must've heard them. >> i guarantee, after a district attorney has been an office for some years, there is not any kind of criminal activity that takes place in the county that he is not aware of. >> dr. wecht speculates that gricar blames himself for those abuses and either walked away or committed suicide. or, dr. wecht says, maybe gricar knew too much. >> somebody said, we've kept it quiet all this time and without you around, we will keep it quiet longer. at the end of mr. gricar. >> but his friends and colleagues rule out any connection between the missing da and the sandusky case. >> i am in no way aware of any reason why there would be a link. as i said before when we talk about the person ray gricar is, i cannot imagine that he would allow something or someo