Die Sister, Die!

Die Sister, Die! (also known as The Companion) is a 1978 American thriller film directed by Randall Hood.

Plot
Edward (Jack Ging) is tired of the "allowance" granted him by his sister Amanda (Edith Atwater) and becomes impatient for her death and his inheritance. To hasten her demise, or at least stop her suicides from being thwarted, Edward hires Esther (Antoinette Bower), a discredited ex-nurse, to watch over her. Esther is less than enthusiastic about killing the old woman, and curious about the secrets held in the house, including a mysterious third sister, Nell.

Cast

 * Jack Ging as Edward
 * Edith Atwater as Amanda
 * Antoinette Bower as Esther
 * Kent Smith as Dr. Thorne
 * Robert Emhardt as Father
 * Rita Conde as Mrs. Gonzalez
 * Peg Shirley as Nell

Soundtrack
The film's score was composed by Hugo Friedhofer, and performed by the National Philharmonic Orchestra conducted by Carl Brandt. It was Friedhofer's final movie work. In 2014 Intrada Records released a limited edition album of the complete score.

Remake
The film was remade in 2013 by director, writer and producer Dustin Ferguson, starring Brinke Stevens as Amanda Price.