|Soap: Episode 39 (1979) [Elaine Lefkowitz-Dallas]: Shot by kidnappers while escaping from them; she dies in Ted Wass' arms shortly afterwards.
Child's Play (1988) [Maggie Peterson]: Falls out of the window while reeling back after Chucky hits her on the head with a toy hammer. (Thanks to Francisco)
A Carol Christmas (2003) [Aunt Marla]: Dies (off-screen), presumably of natural causes, several years before the story begins; she appears as a ghost to her niece (Tori Spelling). (I haven't seen this movie, but it's a modern-day version of A Christmas Carol with Dinah in the "Jacob Marley" role.)