carefully at dan nash. hat he had a lot of problems with mr. nash's reputation for truth and honesty under oath. and from there, we starting interviewing former prosecutors and a number of former court personnel who expressed concerns about his reputation for truth and veracity. >> reporter: remember how, at the trial, nash was presented as a blood spatter expert? he wasn't. in fact, nash had not even taken a basic bloodstain analysis class when he investigated lisa's death. he took a 40-hour course the following year, but was still not an expert when he testified at trial. dwight sought out the best in the field. >> i found two of the world's most renowned blood spatter experts. >> reporter: he sent the crime scene photos to both of them. >> and they both independently came to the same conclusion. >> reporter: that dan nash was, quite simply, dead wrong. one of them wrote -- "the bloodstain evidence, and the presence of gunshot residue on the right hand of lisa jennings are consistent with a self-inflicted