coincidence that someone could see something that they perceived to be more than just some kind of kinky action in a jacuzzi in the morning, and then that actually turn out to be true, that a woman was actually drowned but that spa. that is not a coincidence. that is what she saw. >> the prosecution's theory? somehow, sitting in that spa that morning, chris was overcome by some private fury, who knows what. the hidden violence, is what strunsky called it. and then killed his spouse when he thought nobody was looking. >> chris hall ambushed his wife, grabbed her by the hair, slammed her head twice into the concrete edge. he's holding his wife of almost three decades under the water, showing absolutely no mercy, no remorse. and absolute desire to end her life at that point. >> and then the piece de resistance. >> he then gets out of the spa, walks into the house where his plan is to wake his 22-year-old daughter, who he can use as an alibi witness. >> one little quibble. why? in fact, as convinced as he was of hall's guilt, strunsky conceded the why was a problem. he didn't legally have to know, he said. but he just didn't. there it was. >> it's emotionally unsatisfying not to have that answer, not to know the entire narrative of what happened. >> but you would want to know why this guy, married to this woman for almost 30 years, apparently happily, would suddenly turn on her and drown her in the pool. i had this chest cold, but my medicine kept wearing off. (coughs) ah!