Personally & moo. ... This is a hired killer who has a nefarious past intermingled with some upstanding military, hunting, & LE background. He is good at this & has been a pro for decades. This is not his first rodeo & was paid well for this crime. He is no longer anywhere near that town. Nope, he is far, far away! Maybe back to him home country enjoying some vino & fromagio?
But who hired him? That is another story; a deep, dark Romeo & Juliet-type of story at least in her mind.
She is scorned, lonely & had only one obstacle for the perfect life & that was MB. MB didn't love **him** like she did...she knew of the flirtations/cheating of MB....that is what she interpreted to be. She knew everything about MB & copied her perfume, shampoo, etc. and she knew **he** really loved her (not MB) if only there wasn't that renewal of vows 10 mos ago. She stalked MB--knew everything & even warned her. **He** really meant to keep his renewed vows but not the other one....not MB. No, not her. Disdain. Anger. Rage. Talk about having your cake & eating it too is what she is thinking.
She has money, means, motive & the right vehicle which is SWATperp who did the deed. Nothing gets in her way, least of all MB. She can't live without **him** & MB is making him sick to death. She (MB) doesn't deserve him. But I do so she is toast. If LE doesn't catch me for what I've done (she's thinking), I will get **him** back because it's true love & he will never suspect me. Never. She thinks this case will never be solved. Nope.
All just my theory and all. Purely moo.