I saw this clip from a movie once and basically a woman (Anna) was cheating with her sister’s husband (Mathew). A hired hitwoman goes into the house as Mathew is getting more champagne. “Who the hell are you?” He says. She kills the husband and then after walking upstairs (Anna is calling Mathew saying the water’s getting cold) reads a note to Anna (who is wearing a green bikini in the bathtub) from her sister. “Dearest Anna, I know we’ve shared everything over the years, but (something) draw the line at my husband, even if you are my sister. Now I just have to say one thing.” The hitwoman shoots her in the chest, then head and leaves her body in the bathtub.