|The Six Wives of Henry VIII (1971) [Catherine Howard]: Executed by beheading. (Thanks to PortsGuy)
Les Miserables (1978) [Fantine]: Dies of tuberculosis in bed, while Anthony Perkins is trying to arrest Richard Jordan.
Gangs of New York (2002) [Woman Accomplice]: Shot in the chest by Cameron Diaz, after Angela pulls a knife on Cameron during a robbery on the docks.
Poirot: Appointment with Death (2008) [Nanny]: Drowns herself in a bathtub, possibly having been influenced by John Hannah to do so. (Thanks to Brian)
Your Highness (2011) [Mother]: After combining with Anna Barry and Matyelok Gibbs into a single body, the collective trio are decapitated with a sword at the end of a fight with Natalie Portman.