The CSIs are suddenly faced with two crime scenes when, while investigating the murder of a hotel concierge, they hear gunshots fired across the street and find a woman clutching a gun over two dead bodies. A rooftop swimsuit photo shoot ends badly when the hotel's concierge falls off a balcony and is impaled by a statue. Mac, Danny and Det. Flack question their primary suspect, a supermodel who was seen arguing with the woman shortly before her death. Meanwhile, Stella, Lindsay and Sheldon rush to the scene where a woman (guest star Dedee Pfeiffer) stands in shock after shooting an intruder. The case hits close to home for Stella as the shooting death reminds her of her personal experience with her violent and now deceased ex-boyfriend.