the hidden violence, is what strunsky called it.pouse when he thought nobody was looking. >> chris hall ambushed his wife, grabbed her by the hair, slammed her head twice into the concrete he's holding his wife of almost three decades under the water, showing absolutely no mercy, no an absolute desire to end her life at that point. >> and then the piece de >> 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 >> 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. >> right. and i'm not sure we got the answers to that specific >> kind of an important question