Rent Single White Female 2: The Psycho (2005)

When Holly Parker (Kristen Miller) Moves into her new apartment, she thinks she's found the perfect roommate: Tess Kositch (Allison Large), a sweet and shy young woman who desperately wants to be her friend. But underneath Tess's shy exterior lies a killer, a woman who believes their is nothing sweeter in life than murdering a friend in pain. And Holly is feeling a lot of pain lately, what with her boyfriend cheating on her and her co-worker undermining any chance she has for a promotion. But Holly needn't worry. Tess will take care of her. For Holly is her friend. And for a killer like Tess, there's no greater reward than putting her friends out of their misery.