dr. michael baden, a world renowned forensic pathologist who investigated the deaths ofs of john f.ohn bu loogsy and testified at the trial of o. j. simpson. he was about to turn up the heat on a very cold case. >> the doctor has reviewed the evidence and has determined this could not have been an accidental fall. >> in december of 2008 detectives paid one more visit to stephen scharf. >> they wouldn't tell me what it was for. i had no idea what was about. it didn't make sense. >> 16 years after that fatal night on the cliff, police were back. and stephen scharf was in for a shock. after all these years you thought it was done. >> not until they reach behind and hand me this thing, this arrest warrant. >> coming up, the case heads into court with a surprise from the stand. >> and hear from my mother. >> stephen and jody scharf's only son has some dark secrets to share. >> did you see that abuse? >> i did. >> when "over the edge" continues. where's frank? it's league night! 'saved money on motorcycle insurance with geico! goin' up the country. bowl without me. frank.' i'm going to ge

michael baden, a forensic pathologist, and he provided us with an affidavit and analysis. >> what board certifications do you have? >> three areas of pathology. anatomical pathology, pathological pathology, forensic pathology. >> i think drfute the knife very easily. it was a five-inch blade, the deepest wounds were 63/8 inches. there was a hilt on the knife. there would have been hilt marks for it to go 6 3/8 inches. i felt like wow i had this evidence that these two men were innocent. they're going to finally be freed. we're going to be able to actually conduct an investigation and try and find out who the real killers are. >> randy's incarceration had torn his family apart. randy's brother, state trooper rory steidl, believed randy was guilty. randy's mother wanted to see for herself, so she visited him behind bars. >> you see your mother's eyes, tears streaming down her cheeks. sits down. she said, you look at me right now. did you have anything to do with this at all? i looked her right in her eyes. and i said, mom, i've done some bad things in my life, but i've never done anything like this. you know i'm not capable of doing anything like this. as soon as i got that out of my mouth, she was up and out of that visit

dr. michael baden is a forensic pathologist and he joins us tonight.rd explanation. maybe it's not. you have perspective. tell us. >>u coroners and medical examiners have always got to obeyed judicial orders, period. it may be the situation where the autopsy findings may be important in a criminal investigation, that the district attorney or in this case the fbi asked tobi hold off the releaseo it doesn't interfere with the investigation.nd but that sounds very unlikely is the situation. >> tucker: they are saying this was a single shooter event, and they haven't suggested there is anything outlandish that we don't know about. so what could possibly be the connection between the autopsy results of my continuing investigation. that's confusing. >> that sounds like, especially when the body has been cremated, as i understand, so i can think of a reason, under these circumstances, where all the other autopsies have been released as a result of the judicial order, the court order, why this one wouldn't be. >> tucker: what would we learn, do you think, of i