|She Done Him Wrong (1933) [Russian Rita]: Accidentally stabbed with her own dagger during a struggle with Mae West. (Thanks to Constantine)
Topper Returns (1941) [Lillian, the Housekeeper]: Presumably drowned (off-screen) when H.B. Warner activates a trapdoor and drops her into an underground grotto. We only hear her scream after the lights go out, then see that she's disappeared when the lights come back out. We later learn what happened to her when Eddie 'Rochester' Anderson falls through the trapdoor himself; since Eddie survives, there's a possibility that Rafaella did as well, although it's never confirmed.