The Strange Love of Martha Ivers (1946) (repost)

A ruthless, domineering woman is married to an alcoholic D.A., her childhood companion who is the only living witness to her murder of her rich aunt seventeen years earlier.

Director:

 Lewis Milestone

Writers:

 Robert Rossen (screenplay), John Patrick (story),1 more credit »

Stars:

 Barbara Stanwyck, Van Heflin, Lizabeth Scott - via IMDB 

https://archive.org/details/Martha_Ivers