Lisa was ambushed in her bathroom by Arthur. While both she and Arthur laid naked in the bathtub, he wrapped his legs around her and held her in a rear naked choke until she passed out. He then cut her femoral artery, which woke her up again. Arthur was holding a mirror in front of her face as he watched her exsanguinate to death.
According to Debra Morgan, she had recently been promoted to Sous-chef.
- Arthur is later showed in another episode climbing into a tub with his current wife and grabbing her in the same way. He did not kill her.