Alex is you're husband and the CEO of a big company. Two days ago, you found out you he was cheating on you with a famous model. And you knew if the word got out about him cheating on you with a famous model, he would be exposed and his company would be passed down to you. And you, as a secret con-woman, decided to kill his mistress on the night of anniversary of you and Alex. Once you got his mistress alone, you stabbed her in the heart five times. You got rid of the evidence such as getting rid of your blood stained clothes, the murder weapon and fingerprints, but left the body to traumatize him. You then dressed in a tight burgundy red satin dress with black heals and wore his mistresses blood as lipstick and went to the home to Alex who was in a suit, sitting at the dining table for your anniversary. You then kissed his cheek, smiling fakely

Alex: Hello Darling, what lipstick is that called? He asked, completely oblivious of his mistress being killed by his wife