>> initial reaction is this is troubling. >> so it was because it appeared to back up pam hupp's versionnts soon after the murder. >> i would like to see maybe if you guys can find that letter she was going to send me. >> but whether they looked for it or not they didn't find it. not then. not until just before the second trial. when a cyber crimes investigator finally cracked that computer. a copy of the document was turned over to the defense. >> it is a smoking gun but it's not a smoking gun that leads to russ. i had always said this letter would turn up only because miss hupp was so insistent that this letter was there. >> but this was curious. there was something different about this particular document. different from any other document in betsy's computer. >> once we looked at the letter and had our computer expert analyze it, it turns out that it would be very difficult if not impossible for betsy to have written this the way it came up in her computer. >> why would you say that. >> it was the only one in the computer that said author unknown. >> meaning the document had been com