cause you to believe that he ever would have done the acts that he's accused of in this case? >> never anything. it's inconceivable. >> reporter: adam took the stand too. >> did you hit rebecca on the head? >> i never hit rebecca on the head or anywhere else for that matter. >> and did you devise this scheme to try and cover up your wrongdoing by painting this saying on the door and making it look like she had been hanged by someone else? >> absolutely, positively not. >> reporter: the case went to the jury. did you feel confident as deliberations began? >> i felt we could possibly win very convincingly. >> reporter: less than four hours later, a verdict. >> i sat down next to mary and i said, "mary, i'm sorry. this is probably not good news." >> reporter: this was it. a decision. and even keith greer would be in for quite a plot twist. >> number one, did adam shacknai touch rebecca zahau before rebecca zahau's death with the