Match Point
(2005)

When Nola (Scalett Johansson) catches Chris (Jonathan Rhys-Meyers) in a lie, she expresses impatience about waiting for him to end his marriage with the well-to-do Chloe (Emily Mortimer) and threatens to tell her about their affair.

Chris responds by shooting Nola with a shotgun, making it look like the deed was committed during a robbery. The police question him after coming across Nola's explicit diary, but he gets away with the murder.

Thanks, Joe K.!

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