I can remember several parts of the movie so this could be all over the place.
A man and what’s seems like a younger woman are in a bedroom and he asks her to strip down and proceeds to take photos of her and lays her down on the bed and they have sex.
Theres another scene where she is heavily pregnant and shows him the photo from the scene above.
There seemed to be some level of abuse, whether emotional or physical as he seemed to be taken advantage of her. From this, after having a few kids with him, she hired someone to kill him but it didn’t end well and she was arrested for his murder.
pleas help
Maybe “Lies of the Heart: The Story of Laurie Kellogg”??
https://en.wikipedia.org/wiki/Lies_of_the_Heart:_The_Story_of_Laurie_Kellogg