Dark House (2009) [Lily]: Shot to death (off-screen) by a hologram made "real" by Diane Salinger's spirit. Her body is shown afterwards lying alongside Scott Whyte's as the police investigate and photograph the crime scene. (The police theorize that all the murders were actually commited by Meghan Ory and that everything we'd seen had been Meghan's hallucinations, but the closing scene suggest that Diane's spirit was real after all.) (Thanks to DeMan)
Criminal Minds: Doubt (2007) [Anna Begley]: After attempting to get Vince Grant to kill her; she fatally stabs him for refusing her request. She then commits suicide by stabbing herself in the stomach as FBI agents attempt to arrest her.