Extreme sibling rivalry was front and center in this compelling whodunit directed by Joe Mantegna.
Criminal Minds Season 11 Episode 3 gave us the story of a mentally ill woman who suffered delusions of romance with a photographer. Only she never realized that in fact that her fantasy love interest – Ryan Becker – was in fact wooing her sister and not her.
She saw every woman with whom he flirted as a threat, and imagined that he was telling her to kill them. So she did, as obedient and faithful lovers are wont to do.