respectfully, sandra a. duyst>> investigators sent the note to a forensic document examiner who compared the handwriting to sandy's known handwriting samples. he found it to be consistent. scientists found a fingerprint on the letter. it was sandy's. and dna testing confirmed that sandy licked the envelope to seal it. now that sandy claimed the incident was an attack, investigators reviewed hospital medical records and discovered that the attending physician doubted a horse had done that damage. >> they were semi-circular in nature and there were a number of them, and they put lacerations in her head, which she had to staple shut. and he said it just didn't look like any horse kick injury i'd ever seen. >> dr. john hulsing was in the duysts' barn shortly after the incident. he, too, noticed inconsistencies. >> i went in that stall and i couldn't find any blood on the wall where this reportedly happened. it was all outside of the stall in the walk-in area. >> david duyst was confronted with the letter and denied th