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Rebecca pleads to Sara to let Kate go. Sara points a gun at Rebecca, revealing she killed Rebecca ex-boyfriend, caused Professor Roberts to lose his teaching job and attacked Tracy in the shower.
The two roommates fight. Sara is thrown outside of the room. She begins to fire rounds from the gun, narrowly missing Sarah in the process. Sara attempts to take the fire escape, but loses her balance. She frantically hangs from the balcony window.
Seconds before Sara attempts to shoot Rebecca, Stephen runs into the run to tackle her. He knocks her out with a hard punch to the face. Stephen pulls Rebecca up from the balcony. All of nowhere, Sara bashes Stephen on the back of the head with candle stand or some small heavy item.
The two roommates fight once again. Rebecca points the gun at Sara. She tries to fire a shot at Sara. However, the gun chamber is empty. Sara goes insane. She chokes Rebecca to the point in which she almost loses consciousness. Gasping for air, Rebecca reaches for a sharp weapon. She tells Sara you were never my friend. Then, Rebecca stabs Sara in the back as Sara has done, figuratively speaking.
Rebecca draws in closer to remove her deceased sister's necklace. Sara awakens to startle Rebecca, but then finally dies. The crazy roommate is no longer a threat.
Rebecca returns to her dorm room. She asks Stephen to help her remove the bed. Rebecca refuses to have another roommate, especially a psycho that made her life a living hell. The Roommate movie ends with a resolution, suggesting that any roommate may have a dark past and or a mental condition.