Transcript for 9/27/1998: Experts Dissect JonBenet Ramsey Ransom Note
Sources say the ransom note written by the alleged kidnapper is considered a key piece of evidence. Handwriting experts have ruled out John Ramsey and others close to the family. They have not excluded Patsy Ramsey who has submitted several samples. The ransom note analysis however doesn't end with handwriting. The detectives enlisted the help of this man professor Donald Foster of Vassar College. You look at something and you figure out who wrote it and S yes that's what I do best. Foster analyzes not the handwriting but the taxed the contents and syntax she's if language grammar source material borrowings political or religious opinions and anything that might enter into making. A piece of writing distinctively one person certain others from punctuation to spelling and so on. The professor once discovered Shakespeare was the author of a centuries old manuscript. And the FBI hired him to prove Ted Kaczynski wrote the unabomber manifesto. But he is perhaps best known for proving anonymous was really Newsweek's Joseph Klein. Early in the case Foster actually volunteered his expertise to Patsy Ramsey after reading of her extreme distress. Ironically she never called but the boulder district attorney's office did. In the Ramsey case Foster had high marks for the detectives who brought him an impressive sampling. A patsy Ramsey's writings. Letters and notes even files police retrieved from the family computer. My experience with the boulder detectives was that they were entirely professional and there work that they were dedicated to the case. Have you determined who wrote the ransom note I have no comment. Foster is bound by confidentiality. Agreement with the boulder police department. But sources tell us in his report summarized by detectives in the June presentation of evidence. Foster identified the writer of the ransom note as Patsy Ramsey. Foster analyzed commonly used words and also found similarities. Between patsy is letter format and that of the ransom note writers. The indentations. And punctuation especially the repeated use of the exclamation point. We looked back through our own archives and found two samples of pants he's writing. This 1996 Christmas letter peppered with exclamation points. And this 1978. Photo with the two line note each sentence ending in an exclamation point. Also sources say as many as 250 books were cataloged and photographed from various rooms in the Ramsey house. In the event they yielded possible clues. At least one book found in the bedroom did. Mind hunter by FBI profiler John Douglas. In chapter sixteen there is a case of a young girl who was kidnapped sexually assaulted and suffocated with duct tape. When the killer called the mother he began with the words listen carefully the same to words begin the ransom note. Patsy Ramsey has said she found a note to the bottom of the back spiral staircase she has said she read it and then called for John. In an interview for AME airing tomorrow night John Ramsey wrote called his reaction after he read the note. That was the worst moment. Suddenly realizing that someone had your daughter. Child. This take her if she was gone and we didn't where she lives in and star Q it's cold outside. But there's something curious here according to a source there are no fingerprints on the ransom note. Not patsy Ramsey's nor John Ramsey's. The question is if the ramseys held the note to read it where are their prints.
This transcript has been automatically generated and may not be 100% accurate.