matches samira frasch, and the frequency of occurrence was one in 510 quintillion. >> reporter: and there it was. the story of samira frasch's murder, wrapped up for the jury in a tidy package, thanks to dale folsom. but, did the doctor really confess? this was, after all, still a story coming from a jailhouse snitch, and the golf club with samira's dna on it? maybe not quite so obvious after all. defense attorneys were about to take on dale folsom, and his story, and they couldn't wait. coming up -- the prosecution's timeline, on trial. >> the absence of wrinkling of fingers or toes speaks to the likelihood that she has been immersed for a relatively short period of time. >> testimony that samira may have died later than the prosecutor contends. >> the greatest probability is