This is a sad story. Mark Hacking reminds me of Scott Peterson. There is a look in the eyes that they both have.... vacant and unfeeling. She probably found out her husband had been lying to her and got very upset, went home argued with him and he killed her. Very sad. Another tragedy.....as soon as this tragic story broke, the Berger/Kerry filegate story just disappeared.
At this point, I'm more inclined to think this was a horrendous, 'heat of the moment' act that occured when the sh*t hit the fan & the truth came out about med school. Lori must have been livid, & the arguement could easily have gotten physical.
From what I've seen & heard, it sounds to me like he really did love her and may have killed her by accident or in desperation when she threatened to tell their families. Of course, this doesn't excuse it, and attempting to cover it up & going mental is reprehensible, but I don't think he's a sociopath like Scott Peterson.