Cast of Lonely Hearts

John Travolta plays Elmer Robinson, a detective who becomes obsessed with bringing the killers to justice.

James Gandolfini portrays Det. Charles Hilderbrandt, a fellow detective working with Elmer Robinson on the case.

Jared Leto takes on the role of Ray Fernandez, the charming con man involved in the 'Lonely Hearts Killers' murder spree.

Salma Hayek Pinault portrays Martha Beck, Ray Fernandez's murderous partner and lover.

Scott Caan plays Det. Reilly, one of the detectives embroiled in solving the string of murders.

Laura Dern appears as Rene Fodie, a victim who becomes embroiled in the killers' nefarious schemes.

Michael Gaston plays D.A. Hunt, the district attorney involved in the case.

Dan Byrd portrays Eddie Robinson, the troubled son of detective Elmer Robinson.

Alice Krige takes on the role of Janet Long, one of the characters entangled in the dark narrative of the film.

Dagmara Domińczyk plays Delphine Downing, a single mother who falls victim to the Lonely Hearts Killers.

Bailee Madison portrays Rainelle Downing, the young daughter of Delphine Downing.

Bruce MacVittie appears as Det. Eastman, one of the investigators on the 'Lonely Hearts Killers' case.