Exactly.
I think there was ample evidence before the murder that he was a bit odd. Yesterday I read one of his girlfriend’s blog entries, defending him against accusations (apparently by some of her/their friends) that he had a romantic interest in someone who worked at the lab. It was a peculiar entry. Most young women who truly believed their boyfriend had no interest in any other women wouldn’t feel the need to post such a defensive diatribe in a public blog. But in addition to defending him, the entry also mentioned that he was different and perhaps naive, and that people just didn’t understand him. The jist of the whole thing was “he’s really special and nobody understands him and if you did, you couldn’t possibly believe he’d be interested in anybody but me”. It came across as describing an odd guy with a girlfriend who was also a bit mentally off.