Ruth Marx was played by Wendy Gazette in the movie The Net.
She was the impostor, who took over Angela Bennett´s life. She is the partner of Jack Devlin and also works for the Praetorians. She took Angela Bennett´s identity and vice versa and also blackmailed her into giving her the disk in return for her life, which she wanted to destroy anyway.
She was accidentally killed by Jack Devlin, when he thought she was her, while they both tried to kill her.