|Hill Street Blues: Queen for a Day (1985) [Gina Srignoli]: Shot in the stomach by a hitman in a restaurant. (Thanks to Rob)
Remote Control (1987) [Allegra James]: Strangled in her bedroom by Frank Beddor after he falls under the influence of the alien videotape. (Thanks to Dick Hertz)
Far from Home (1989) [Amy]: Killed in an explosion when Anthony Rapp uses a remote-controlled toy car to ignite the gasoline leaking from her car.
Bullets Over Broadway (1994) [Olive Neal]: Shot to death by Chazz Palminteri on a dock. Jennifer is out of camera frame during the shooting; we only see Chazz firing and hear (but don't see) Jennifer scream and fall into the water.
Man with a Gun (Gun for Hire; Hired for Killing) (1996) [Rena Rushton/Kathy Payne]: Playing a dual role as twin sisters, "Rena" is shot to death by Michael Madsen. ("Kathy" survives the movie.) (Thanks to Dick Hertz)
Bride of Chucky (1998) [Tiffany]: Electrocuted when Chucky knocks the TV set into her bathtub. He then performs an occult ceremony to resurrect her spirit in the body of a doll (causing her actual body to suddenly sit up in the tub and then sink back down). The doll Tiffany later "dies" in childbirth, but was brought back to life in the 2004 sequel Seed of Chucky.
Hide and Seek (Cord) (2000) [Helen]: Bludgeoned to death (off-camera) with part of a bed frame by Daryl Hannah, when Jennifer suddenly jumps up and attacks her after apparently being strangled. (Thanks to Cara)
The Haunted Mansion (2003) [Madame Leota]: Plays a ghost who manifests herself as a disembodied head in a crystal ball. (Thanks to PortsGuy)
El Padrino (2004) [Sebeva]: Neck snapped, after first being shot. (Thanks to Cara)
Seed of Chucky (2004) [Jennifer Tilly/Tiffany]: Playing a dual role as both herself and the doll Tiffany, Jennifer's soul is transferred into the doll when Tiffany performs an occult ceremony to switch bodies with her; immediately afterwards, the doll is hacked to "death" with an axe by Chucky. (It isn't obvious that the body-switching spell was successful until a subsequent scene of Jennifer killing Rebecca Santos.) (Thanks to David31, Frank, PortsGuy and Davo)
Tideland (2005) [Queen Gunhilda]: Dies of a drug overdose. (Thanks to Rob)