|Macbeth (1948) [Lady Macbeth]: Commits suicide by throwing herself off a cliff; we see her falling away into the distance from above.
The Big Heat (1953) [Bertha Duncan]: Shot several times in the chest and stomach by Gloria Grahame when Jeanette is about to telephone Alexander Scourby.
Alfred Hitchcock Presents: The Young One (1957) [Aunt Mae]: Pushed down a flight of stairs (off-screen) by her niece (Carol Lynley); her body is shown afterwards as the police investigate.
Two Rode Together (1961) [Mrs. Mary McCandless]: Killed by David Kent after she sets him free.
The Alfred Hitchcock Hour: Triumph (1964) [Mary Fitzgibbons]: Stabbed to death (off-screen) by Maggie Pierce after Jeanette goes into Maggie's tent with a knife; we're initially led to believe that Jeanette killed Maggie until the end of the episode, when Maggie's veil is lifted and her identity revealed.
Night Gallery: The Housekeeper (1970) [Miss Wattle]: After Larry Hagman mystically switches Jeanette's mind with Suzy Parker's, Larry then injects Jeanette's body with a drug or poison to simulate a heart attack. The scene cuts away as Larry approaches with the needle. (Since it's Suzy's character who dies in Jeanette's body, I'm listing this under both actresses.)
Night Gallery: Since Aunt Ada Came to Stay (1971) [Aunt Ada]: Bursts into flame and disappears into nothingness after James Farentino sets fire to a flower to counteract Jeanette's magical powers.