michael bodden, a world renowned forensic pathologist who investigated the deaths of john f.ennedy and john belushi and testified at the trial of o.j. simpson. he was about to turn up the heat on a cold case. >> dr. bodden reviewed the evidence and determined that it could not have been an accidental fall. >> in december of 2008, detectives paid one more visit to steven. >> they wouldn't tell me what it was for. i had no idea what this was about. it didn't make sense. >> 16 years after that fatal night on the cliff, police were back. and steven was in for a shock. after all these years you thought it was done. >> not until they reached behind and handed me this thing. this arrest warrant. >> coming up, the case heads into court with a surprise from the stand. >> i'm here for my mother. >> steven and jody's only son has some dark secrets to share. >> did you see the abuse? >> i did. >> when "dateline" continues. for mild-to-moderate eczema, eucrisa can be used almost everywhere on almost everybody. like the fingers of a flight attendant. the side of a super hero. or the leg of