Steroids. The dude had a pharmacopia and it made him crazy. His prior female acquaintances need to step up and verify this if and when called upon by the prosecutors. Betcha he liked the steroids more than he liked the babes. And for a number of reasons the combination can lead to trouble.
As to steroids: didn’t he just compete in the Olympic games and wouldn’t he have been tested for such (more easily detected than other forms of doping)? As to the rest: my first guess was that she dumped him and he wasn’t acceptive to the rejection.
Throw in a rocket launcher too, that's what the MSM did for Dorner.........