Kristen killed LeRoux ... and is getting away with it so far. When serial killer Orson LeRoux (Darren Pettie) threatened her family, Kristen took action and murdered him. She even made sure his wife had an alibi so she wouldn't pay for her crime.
But Evil, as it is wont to do, took things a step further, and weirder: As the episode ended, Kristen picked up a cross stashed in her bathroom and it burned her, suggesting that the Devil is starting to possess her (or she has a very guilty conscience).