Happy Face Murders (1999)

Synopsis
Ann-Margret and Nicholas Campbell star in this suspense story based on actual incidents. Lorraine, a woman who enjoys mystery novels, is tired of being slapped around by her boyfriend and decides to tell the police he's guilty of murder. However, the detectives looking into the case are a bit confused when certain details in Lorraine's story keep changing. However, the real murderer, who is still at large, is even more puzzled by these events, which leads to danger Lorraine wasn't expecting. ~ Mark Deming, All Movie Guide