Killing Me Softly
Adam (Joseph Fiennes), the suspicious new husband of Alice (Heather Graham), raped his sister Deborah when they were kids. Since then she has been killing all of his lovers. When Deborah as she tries to kill Adam, Alice kills her, and then divorces Adam (the first logical step she has taken during the entire film).
Thanks, Mystery Me!
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Read more about this film at The Internet Movie Database.