Do you have any data to support the claim that most crimes of passion involve "him making a pass at her"? This seems like an obvious narrative for a TV show but this is merely one of hundreds of possibilities that could result in her accidental death.

My "most" claim was more generic, in that they are situational, triggered by emotions (and lack of emotional control), and most often between people that know each other. Him making a pass at her is merely my conjecture of how that might have happened in this particular case, based on the circumstances that have been reported.