The film centres on a businessman (Elba) who has a beautiful wife (Knowles) and successful career until he starts being stalked by a temp worker (Larter).
Knowles recently signed up to play blues icon Etta James in Cadillac Records. Larter is know for her role in NBC's hit show Heroes. Elba was last seen in Ridley Scott's American Gangster.
British TV helmer Steve Shill will direct Obsessed from a script by David Loughery.