was a master military leader, he said. did say on destroying the marriage anywhere she could. >> rob taglianetti, she wanted out of her life. keith reed, she wanted to be with him. she did whatever she needed to do to accomplish both of those ends. >> take robs discovery of his wife's sexual emails. the defense suggested mary left that email open on purpose. why? maybe because a confrontation between the two men was for a goal. why else, he said, would she not have alerted the authorities to her husband's impending showdown with the superintendent. >> if you're really worried of what your husband is going to do to another individual, wouldn't you call the officials? would you call the police? she waits, literally, days to call law enforcement. >> mary taglianetti, a prosecution witness, says she's appalled by the defenses theory and finds it preposterous. how was killing keith reed and getting her husband thrown in his run supposed to solve any problems? >> i didn't do anything of that on purpose.