dr. michael badden, a world-renowned forensic pathologist who investigated the deaths of john f.testified at the trial of o.j. simpson. he was about to turn up the heat on a very cold case. >> dr. michael badden has reviewed the evidence and has determined that 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 this was about. i mean, it didn't make sense. >> sixteen 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. >> here for my mother. >> stephen and jody scharf's only son has some dark secrets to share. >> did you see that abuse? >> i did. woman: day care can be expensive. so to save some money, i found one that uses robots instead of real people. 'cuz robots work for free. robot 1:good morning... robot 1: