Hi coolmom,
I think I read that he did have scratches on his hands and arms, but also had some on his chest. I don't think the scratches on the chest necessarily indicate a sexual assault. I feel morbid for even imagining this, but she probably was flailing her hands/arms trying to defend herself during the attack, and was trying to connect anywhere on his body to try to stop him. Plus, we don't know the details yet--if she was indeed strangled, we don't know if he was facing her, or approached her from behind, etc which may change where Annie was able to scratch him.
My general thoughts so far. . . I think this was about his male ego and control the one tiny little space that he was able to exert some influence in. I worked in the pharmaceutical research field for a dozen years. It's not true of every company I worked for, but in general, there was what I called academic snobbery--the techs versus the people with Bachelor's degrees versus the people with PhD's versus the few with MD/PhD's. I had a Bachelor's degree and was dismayed to find out that at some companies, it didn't matter what you "could" do--it all boiled down to the academic level that you achieved. And quite often, in all honesty, a person with 5 years experience and a BS degree was more capable in the lab than someone just entering the field with a PhD, just as I am sure there were jobs that the technicians could have done that were being doled out to those of us with bachelor's degrees. Didn't matter though--if you didn't have a PhD, you could spend your entire career working your buns off and never seeing the level that someone who waltzes in fresh from their Post-Docs. I've never worked in an academic science lab, but my coworkers told me it was even worse--way more narrowly defined roles pretty much exclusively dependent on what your level of education was.
I'm sure as a "tech" that this guy felt like he was at the bottom of the bunch and so he overcompensated by being a complete control freak. And Annie was a woman his age, was completely beautiful and charming and had achieved so much more than he ever would dream of achieving. And he obviously sounds like he has had some issues with women (and I think when men have "issues" with women, it's the beautiful and talented ones that garner the most resentment--probably because on one hand, he was attracted to her, yet on the other hand her success made him feel resentful). And although Annie's initial response to his griping was conciliatory and cooperative, maybe Annie had gotten sick and tired of him nit-picking her for every little thing that she did "wrong" in regards to the animals--plus I'm sure she was probably stressed out about her upcoming wedding (she probably had a billion things to do and was just at a higher anxiety level). Maybe she said something that wasn't really that horrible, but in his eyes, was a great insult. And he struck out at her--a representation in his eyes of all his resentment and frustrations--and took her life away from her in a horribly brutal way.
Bottom line. . . I don't care what his excuses are, he deserves to be put away in jail for the rest of his life. I'm just trying to figure out why he would do this. In the end, he needs to go away. Just because you feel like a bottom of the barrel, insecure loser doesn't ever give you the justification for hurting another human being!!!!