kittel first looked at known handwriting samples from both nancy and richard. despite their similarities, there were differences. >> she used her ampersands quite extensively through her writing, so every fifth, sixth line would have an ampersand on it, in her known handwriting, where richard always used the a-n-d for the verbiage and. >> kittel also noticed that nancy and richard made their capital "i" differently. >> richard used one down stroke like a 1, whereas nancy used a down stroke and then a cross at the top and bottom. she was willing to take a lot more time in executing them than richard was. >> their lowercase fs were different as well. >> richard used a clockwise motion coming down from the top of the "f" down to the bottom. he would swing off in a clockwise motion to finish off the lower loop of the "f," whereas nancy always came down and went counterclockwise to finish off the "f." >> kittel concluded richard wrote the diary entries about nancy's brother, bill. >> absolutely certain that he had written that. >> 100% certain? >> yes. >> prosecutor