TTF14, film producers are typically charismatic individuals. I always say funny and smart will get you farther than good looking and sedate. I'm not saying her husband was boring (for all I know, he could be the funniest guy on earth), but she probably liked the "glamour" of her lover's connections and entertainment background. She wouldn't be the first to be taken with such things.
So sordid and messy. Sorry for her children, husband and the BF's wife. I found the BF's FB page and his wife is also very pretty, blonde and slight. She claims to have studied at Yale law, so she's no dummy either. She and the deceased could be related.
What a horrible waste of a productive life. In the end, my money's on an OD and the guys panicked.