>> you don't have a sexual relationship with somebody within two weeks after your wife's been murdered in that house. >> but the jury never heard marianne crandall's testimony because there was no indication of a romantic relationship prior to dar's murder, the judge ruled, just as he did in first trial, that her testimony was prejudicial and, therefore, inadmissible. it was a huge blow to the prosecution's case. >> it supports the position that they weren't this deeply in love couple that he kept trying to present. i mean, that would have proven that. >> but norris still had her two key witnesses, tom's own son heath and heath's friend skyler watty, both two years older and now more certain than ever about what they saw and heard the day dar was killed. >> last year at church camp i went for one of our activities. we fired shotguns, and it most resembled that sound. >> then it was time for heath to take the stand.