john holsing was in the duyst barn shortly after the incident. 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 that the incident was anything other than an accident. but he did make a confession. he admitted he was having an affair with his secretary, linda ryan, and that sandy had found out about it. david also gave police a voice mail sandy left on his office phone. he said it proved she was suicidal. >> david, as far as i'm concerned, my christmas is over, my life is over, and you can -- you can go on without me. i don't know what else to say. >>> police now had evidence that >>> police now had evidence that sandy duyst's horse barn incident was no accident. in a letter found among her private papers, sandy described the incident as a murder attempt perpetrated by her husband. >> my accident was no accident. look first at david duyst. >> instead of leaving