The Ending Of You May Now Kill The Bride Explained

Right from the surprise engagement at the beginning of the film, Audrey tries to sabotage the imminent wedding of Mark and Nicole. After initially dismissing the idea that Audrey's behind her wedding-related issues, Nicole discovers evidence of Audrey's meddling before Audrey pulls a knife on Nicole, insisting that she can't take Mark away from her. Mark eventually manages to talk Audrey down, and they decide to go ahead with the wedding.

On the wedding day, however, Nicole is in her bridal suite, about to drink some champagne that Mark sent her when she sees the words "He's mine" written on the mirror in lipstick. Audrey ambushes Nicole, steals her wedding dress and wedding ring, and sets her in the bathtub, making her imminent death look like suicide as Audrey goes to the wedding as Nicole.

This is key because it establishes how far Audrey is willing to go to keep Mark. It also solidifies — both with Audrey's actions toward Nicole and her admission — that the woman we see getting killed in the opening scenes of the film was Rachel, Mark's former fiancé, proving that she didn't die by suicide as Mark thinks. While the depths of Audrey's obsession was evident before, this proves the extreme lengths she will go to ensure that she is the only viable romantic partner in Mark's life, as she is willing to not only commit sabotage and psychologically manipulate people, but commit murder if she decides it's needed.