Beyond Reason 1995 on netflix

Drama based on a real-life story of a love affair between a married army captain and a young female soldier. Susan Christie and Duncan McAllister have an affair, but Duncan ends the relationship when he’s posted to Germany. Three days later, Susan and Duncan’s wife, Penny, go for a walk in the woods in Northern Ireland. Fifteen minutes later, Penny is dead and Susan claims they were attacked by an unknown man.